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<!-- Generated by DFIN XBRL Schema Document - http://www.dfinsolutions.com/ - on 15-10-2026 06:26:20 AM -->
<!-- Copyright(c) 2026 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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	<import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
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	<import namespace="http://fasb.org/us-types/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd"/>
	<import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>   
	<import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/>
	<import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/>
	<import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd"/>
	<import namespace="http://xbrl.sec.gov/oef-sr/2025" schemaLocation="https://xbrl.sec.gov/oef/2025/oef-sr-2025.xsd"/>
	<import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
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				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReport" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReport"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportHoldingsDetails"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportLineGraphDetails"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportAverageAnnualReturnDetails"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly"/>
				<link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/LargestHoldingOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#LargestHoldingOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/Other1CategoryOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#Other1CategoryOnly"/>
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				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#BroadBasedIndexOnly"/>
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					<link:loc xlink:type="locator" xlink:href="#mstiv_INGGroepNVMember" xlink:label="INGGroepNVMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="INGGroepNVMember" order="32.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_UBSGroupAGMember" xlink:label="UBSGroupAGMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="UBSGroupAGMember" order="33.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_BancoBilbaoVizcayaArgentariaSAMember" xlink:label="BancoBilbaoVizcayaArgentariaSAMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="BancoBilbaoVizcayaArgentariaSAMember" order="34.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_NovartisAGMember" xlink:label="NovartisAGMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="NovartisAGMember" order="35.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_BNPParibasSAMember" xlink:label="BNPParibasSAMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="BNPParibasSAMember" order="36.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_ASMLHoldingNVMember" xlink:label="ASMLHoldingNVMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="ASMLHoldingNVMember" order="37.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_TaiwanSemiconductorManufacturingCoLtdADRMember" xlink:label="TaiwanSemiconductorManufacturingCoLtdADRMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="LargestHoldingsDomain" xlink:to="TaiwanSemiconductorManufacturingCoLtdADRMember" order="38.0" />
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_GeographicRegionDomain" xlink:label="GeographicRegionDomain"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US" xlink:label="US"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="US" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB" xlink:label="GB"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="GB" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_NO" xlink:label="NO"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="NO" order="4.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP" xlink:label="JP"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="JP" order="5.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_DE" xlink:label="DE"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="DE" order="6.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_FR" xlink:label="FR"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="FR" order="7.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA" xlink:label="CA"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="CA" order="8.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_BR" xlink:label="BR"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="BR" order="9.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AU" xlink:label="AU"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="AU" order="10.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN" xlink:label="CN"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="CN" order="11.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GR" xlink:label="GR"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="GR" order="12.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IN" xlink:label="IN"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="IN" order="13.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_KR" xlink:label="KR"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="KR" order="14.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX" xlink:label="MX"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="MX" order="15.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_ZA" xlink:label="ZA"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="ZA" order="16.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_TW" xlink:label="TW"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="TW" order="17.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AE" xlink:label="AE"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="AE" order="18.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CH" xlink:label="CH"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="CH" order="19.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_NL" xlink:label="NL"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="GeographicRegionDomain" xlink:to="NL" order="20.0" />
					<!--IndustrySectorDomain Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrySectorDomain" xlink:label="IndustrySectorDomain"/>	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_UtilitiesSectorMember" xlink:label="UtilitiesSectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="UtilitiesSectorMember" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_MaterialsSectorMember" xlink:label="MaterialsSectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="MaterialsSectorMember" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_InformationTechnologySectorMember" xlink:label="InformationTechnologySectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="InformationTechnologySectorMember" order="4.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrialSectorMember" xlink:label="IndustrialSectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="IndustrialSectorMember" order="5.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ConsumerStaplesSectorMember" xlink:label="ConsumerStaplesSectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="ConsumerStaplesSectorMember" order="6.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ConsumerDiscretionarySectorMember" xlink:label="ConsumerDiscretionarySectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="ConsumerDiscretionarySectorMember" order="7.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CommunicationsSectorMember" xlink:label="CommunicationsSectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="CommunicationsSectorMember" order="8.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateSectorMember" xlink:label="RealEstateSectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="RealEstateSectorMember" order="9.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HealthcareSectorMember" xlink:label="HealthcareSectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="HealthcareSectorMember" order="10.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialServicesSectorMember" xlink:label="FinancialServicesSectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="FinancialServicesSectorMember" order="11.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnergySectorMember" xlink:label="EnergySectorMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IndustrySectorDomain" xlink:to="EnergySectorMember" order="12.0" />
					<!--CreditQualityDomain Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CreditQualityDomain" xlink:label="CreditQualityDomain"/>	
					<link:loc xlink:type="locator" xlink:href="#mstiv_AOnePlusMember" xlink:label="AOnePlusMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="AOnePlusMember" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_AOneMember" xlink:label="AOneMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="AOneMember" order="3.0" />
					<!--ExternalCreditRatingFitchMember Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExternalCreditRatingFitchMember" xlink:label="ExternalCreditRatingFitchMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="ExternalCreditRatingFitchMember" xbrldt:usable="false" order="1.0"/>
					<!--ExternalCreditRatingMoodysMember Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExternalCreditRatingMoodysMember" xlink:label="ExternalCreditRatingMoodysMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="ExternalCreditRatingMoodysMember" xbrldt:usable="false" order="2.1"/>
					<!--ExternalCreditRatingStandardPoorsMember Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExternalCreditRatingStandardPoorsMember" xlink:label="ExternalCreditRatingStandardPoorsMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="ExternalCreditRatingStandardPoorsMember" xbrldt:usable="false" order="3.1"/>
					<!--CreditRatingAMBestDomain Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CreditRatingAMBestDomain" xlink:label="CreditRatingAMBestDomain"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="CreditRatingAMBestDomain" xbrldt:usable="false" order="4.1"/>
				</link:presentationLink>
				<link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails">            
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000124428Member" xlink:label="C000124428Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000124428Member" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006505Member" xlink:label="C000006505Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000006505Member" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006516Member" xlink:label="C000006516Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000006516Member" order="4.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006515Member" xlink:label="C000006515Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000006515Member" order="5.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006513Member" xlink:label="C000006513Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000006513Member" order="6.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006511Member" xlink:label="C000006511Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000006511Member" order="7.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006510Member" xlink:label="C000006510Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000006510Member" order="8.0" />
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					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000006517Member" order="11.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000124429Member" xlink:label="C000124429Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000124429Member" order="12.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107824Member" xlink:label="C000107824Member"/>
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					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107823Member" xlink:label="C000107823Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000107823Member" order="14.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107822Member" xlink:label="C000107822Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000107822Member" order="15.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107821Member" xlink:label="C000107821Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000107821Member" order="16.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107820Member" xlink:label="C000107820Member"/>
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					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107819Member" xlink:label="C000107819Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000107819Member" order="18.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107818Member" xlink:label="C000107818Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000107818Member" order="19.0" />
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107817Member" xlink:label="C000107817Member"/>
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					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="INGGroepNVMember" order="31.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_UBSGroupAGMember" xlink:label="UBSGroupAGMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="UBSGroupAGMember" order="32.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_BancoBilbaoVizcayaArgentariaSAMember" xlink:label="BancoBilbaoVizcayaArgentariaSAMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="BancoBilbaoVizcayaArgentariaSAMember" order="33.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_NovartisAGMember" xlink:label="NovartisAGMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="NovartisAGMember" order="34.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_BNPParibasSAMember" xlink:label="BNPParibasSAMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="BNPParibasSAMember" order="35.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ASMLHoldingNVMember" xlink:label="ASMLHoldingNVMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="ASMLHoldingNVMember" order="36.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_TaiwanSemiconductorManufacturingCoLtdADRMember" xlink:label="TaiwanSemiconductorManufacturingCoLtdADRMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="TaiwanSemiconductorManufacturingCoLtdADRMember" order="37.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SalesLoadOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_WithSalesLoadMember" xlink:label="WithSalesLoadMember"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="InvestmentTypeCategorizationMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMember" xlink:label="EquityMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="EquityMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="MoneyMarketFundsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MoneyMarketFundsMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember" xlink:label="USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember" xlink:label="RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember" order="4.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_BroadBasedIndexDomain" xlink:label="BroadBasedIndexDomain"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_Russell3000IndexMember" xlink:label="Russell3000IndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="Russell3000IndexMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MSCIAllCountryWorldIndexNetDivMember" xlink:label="MSCIAllCountryWorldIndexNetDivMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="MSCIAllCountryWorldIndexNetDivMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MSCIEmergingMarketsIndexNetDivMember" xlink:label="MSCIEmergingMarketsIndexNetDivMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="MSCIEmergingMarketsIndexNetDivMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MSCIAllCountryWorldExUSIndexNetDivMember" xlink:label="MSCIAllCountryWorldExUSIndexNetDivMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="MSCIAllCountryWorldExUSIndexNetDivMember" order="4.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly">              
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AdditionalIndexDomain" xlink:label="AdditionalIndexDomain"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_RussellMidcapGrowthIndexMember" xlink:label="RussellMidcapGrowthIndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="RussellMidcapGrowthIndexMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MSCIAllCountryWorldSmallMidCapIndexNetDivMember" xlink:label="MSCIAllCountryWorldSmallMidCapIndexNetDivMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="MSCIAllCountryWorldSmallMidCapIndexNetDivMember" order="2.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/MaturityOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_MaturityDomain" xlink:label="MaturityDomain"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ZeroTo7DaysMember" xlink:label="ZeroTo7DaysMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="ZeroTo7DaysMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_EightTo29DaysMember" xlink:label="EightTo29DaysMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="EightTo29DaysMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ThirtyTo59DaysMember" xlink:label="ThirtyTo59DaysMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="ThirtyTo59DaysMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_SixtyTo89DaysMember" xlink:label="SixtyTo89DaysMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="SixtyTo89DaysMember" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_NinetyTo365DaysMember" xlink:label="NinetyTo365DaysMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="NinetyTo365DaysMember" order="5.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/IndustrySectorOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrySectorDomain" xlink:label="IndustrySectorDomain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/CreditQualityOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CreditQualityDomain" xlink:label="CreditQualityDomain"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_AOnePlusMember" xlink:label="AOnePlusMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="AOnePlusMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_AOneMember" xlink:label="AOneMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="AOneMember" order="2.0"/>
				</link:definitionLink>
				<!--GeographicRegionOnly use only for STPR-->
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/GeographicRegionOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_GeographicRegionDomain" xlink:label="GeographicRegionDomain"/>
				</link:definitionLink>
				<link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">               
					<link:loc xlink:type="locator" xlink:href="#mstiv_AxonEnterpriseIncMember" xlink:label="AxonEnterpriseIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_AxonEnterpriseIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Axon Enterprise Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AxonEnterpriseIncMember" xlink:to="label_AxonEnterpriseIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_RobinhoodMarketsIncMember" xlink:label="RobinhoodMarketsIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_RobinhoodMarketsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Robinhood Markets Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RobinhoodMarketsIncMember" xlink:to="label_RobinhoodMarketsIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_TakeTwoInteractiveSoftwareIncMember" xlink:label="TakeTwoInteractiveSoftwareIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_TakeTwoInteractiveSoftwareIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Take Two Interactive Software Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TakeTwoInteractiveSoftwareIncMember" xlink:to="label_TakeTwoInteractiveSoftwareIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_RevolutionMedicinesIncMember" xlink:label="RevolutionMedicinesIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_RevolutionMedicinesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Revolution Medicines Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RevolutionMedicinesIncMember" xlink:to="label_RevolutionMedicinesIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_AscendisPharmaASADRMember" xlink:label="AscendisPharmaASADRMember"/>
					<link:label xlink:type="resource" xlink:label="label_AscendisPharmaASADRMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Ascendis Pharma A S ADR [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AscendisPharmaASADRMember" xlink:to="label_AscendisPharmaASADRMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MonolithicPowerSystemsIncMember" xlink:label="MonolithicPowerSystemsIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_MonolithicPowerSystemsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Monolithic Power Systems Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MonolithicPowerSystemsIncMember" xlink:to="label_MonolithicPowerSystemsIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_SnowflakeIncAMember" xlink:label="SnowflakeIncAMember"/>
					<link:label xlink:type="resource" xlink:label="label_SnowflakeIncAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Snowflake Inc A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SnowflakeIncAMember" xlink:to="label_SnowflakeIncAMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_CloudflareIncAMember" xlink:label="CloudflareIncAMember"/>
					<link:label xlink:type="resource" xlink:label="label_CloudflareIncAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Cloudflare Inc A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CloudflareIncAMember" xlink:to="label_CloudflareIncAMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_LiveNationEntertainmentIncMember" xlink:label="LiveNationEntertainmentIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_LiveNationEntertainmentIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Live Nation Entertainment Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="LiveNationEntertainmentIncMember" xlink:to="label_LiveNationEntertainmentIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_NateraIncMember" xlink:label="NateraIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_NateraIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Natera Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NateraIncMember" xlink:to="label_NateraIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_RussellMidcapGrowthIndexMember" xlink:label="RussellMidcapGrowthIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_RussellMidcapGrowthIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Russell Midcap Growth Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RussellMidcapGrowthIndexMember" xlink:to="label_RussellMidcapGrowthIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_Russell3000IndexMember" xlink:label="Russell3000IndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_Russell3000IndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Russell 3000 Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Russell3000IndexMember" xlink:to="label_Russell3000IndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000124428Member" xlink:label="C000124428Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000124428Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000124428 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000124428Member" xlink:to="label_C000124428Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000124428Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class R6</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000124428Member" xlink:to="label_C000124428Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006505Member" xlink:label="C000006505Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006505Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006505 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006505Member" xlink:to="label_C000006505Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006505Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class R4</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006505Member" xlink:to="label_C000006505Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006516Member" xlink:label="C000006516Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006516Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006516 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006516Member" xlink:to="label_C000006516Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006516Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class R3</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006516Member" xlink:to="label_C000006516Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006515Member" xlink:label="C000006515Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006515Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006515 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006515Member" xlink:to="label_C000006515Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006515Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class R2</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006515Member" xlink:to="label_C000006515Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006513Member" xlink:label="C000006513Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006513Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006513 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006513Member" xlink:to="label_C000006513Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006513Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class R1</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006513Member" xlink:to="label_C000006513Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006511Member" xlink:label="C000006511Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006511Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006511 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006511Member" xlink:to="label_C000006511Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006511Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class I</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006511Member" xlink:to="label_C000006511Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006510Member" xlink:label="C000006510Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006510Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006510 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006510Member" xlink:to="label_C000006510Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006510Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class C</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006510Member" xlink:to="label_C000006510Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006509Member" xlink:label="C000006509Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006509Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006509 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006509Member" xlink:to="label_C000006509Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006509Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class B</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006509Member" xlink:to="label_C000006509Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006504Member" xlink:label="C000006504Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006504Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006504 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006504Member" xlink:to="label_C000006504Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006504Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class A</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006504Member" xlink:to="label_C000006504Member_2"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateSectorMember" xlink:label="RealEstateSectorMember"/>
					<link:label xlink:type="resource" xlink:label="label_RealEstateSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Real Estate Sector [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RealEstateSectorMember" xlink:to="label_RealEstateSectorMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HealthcareSectorMember" xlink:label="HealthcareSectorMember"/>
					<link:label xlink:type="resource" xlink:label="label_HealthcareSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Healthcare Sector [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="HealthcareSectorMember" xlink:to="label_HealthcareSectorMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialServicesSectorMember" xlink:label="FinancialServicesSectorMember"/>
					<link:label xlink:type="resource" xlink:label="label_FinancialServicesSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Financial Services Sector [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinancialServicesSectorMember" xlink:to="label_FinancialServicesSectorMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnergySectorMember" xlink:label="EnergySectorMember"/>
					<link:label xlink:type="resource" xlink:label="label_EnergySectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Energy Sector [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EnergySectorMember" xlink:to="label_EnergySectorMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMember" xlink:label="EquityMember"/>
					<link:label xlink:type="resource" xlink:label="label_EquityMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Equity [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EquityMember" xlink:to="label_EquityMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="MoneyMarketFundsMember"/>
					<link:label xlink:type="resource" xlink:label="label_MoneyMarketFundsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Money Market Funds [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MoneyMarketFundsMember" xlink:to="label_MoneyMarketFundsMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000006517Member" xlink:label="C000006517Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000006517Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000006517 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006517Member" xlink:to="label_C000006517Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000006517Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class *</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000006517Member" xlink:to="label_C000006517Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember" xlink:label="USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember"/>
					<link:label xlink:type="resource" xlink:label="label_USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">U S Treasury and U S Government Agency Securities and Equivalents [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember" xlink:to="label_USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember" xlink:label="RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember" xlink:to="label_RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ZeroTo7DaysMember" xlink:label="ZeroTo7DaysMember"/>
					<link:label xlink:type="resource" xlink:label="label_ZeroTo7DaysMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Zero To 7 Days [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ZeroTo7DaysMember" xlink:to="label_ZeroTo7DaysMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_EightTo29DaysMember" xlink:label="EightTo29DaysMember"/>
					<link:label xlink:type="resource" xlink:label="label_EightTo29DaysMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Eight To 29 Days [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EightTo29DaysMember" xlink:to="label_EightTo29DaysMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ThirtyTo59DaysMember" xlink:label="ThirtyTo59DaysMember"/>
					<link:label xlink:type="resource" xlink:label="label_ThirtyTo59DaysMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Thirty To 59 Days [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ThirtyTo59DaysMember" xlink:to="label_ThirtyTo59DaysMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_SixtyTo89DaysMember" xlink:label="SixtyTo89DaysMember"/>
					<link:label xlink:type="resource" xlink:label="label_SixtyTo89DaysMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Sixty To 89 Days [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SixtyTo89DaysMember" xlink:to="label_SixtyTo89DaysMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_NinetyTo365DaysMember" xlink:label="NinetyTo365DaysMember"/>
					<link:label xlink:type="resource" xlink:label="label_NinetyTo365DaysMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Ninety To 365 Days [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NinetyTo365DaysMember" xlink:to="label_NinetyTo365DaysMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_AOnePlusMember" xlink:label="AOnePlusMember"/>
					<link:label xlink:type="resource" xlink:label="label_AOnePlusMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">A One Plus [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AOnePlusMember" xlink:to="label_AOnePlusMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_AOneMember" xlink:label="AOneMember"/>
					<link:label xlink:type="resource" xlink:label="label_AOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">A One [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AOneMember" xlink:to="label_AOneMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MSCIAllCountryWorldSmallMidCapIndexNetDivMember" xlink:label="MSCIAllCountryWorldSmallMidCapIndexNetDivMember"/>
					<link:label xlink:type="resource" xlink:label="label_MSCIAllCountryWorldSmallMidCapIndexNetDivMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MSCI All Country World Small Mid Cap Index net div [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MSCIAllCountryWorldSmallMidCapIndexNetDivMember" xlink:to="label_MSCIAllCountryWorldSmallMidCapIndexNetDivMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_CharlesRiverLaboratoriesInternationalIncMember" xlink:label="CharlesRiverLaboratoriesInternationalIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_CharlesRiverLaboratoriesInternationalIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Charles River Laboratories International Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CharlesRiverLaboratoriesInternationalIncMember" xlink:to="label_CharlesRiverLaboratoriesInternationalIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_EuronextNVMember" xlink:label="EuronextNVMember"/>
					<link:label xlink:type="resource" xlink:label="label_EuronextNVMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Euronext N V [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EuronextNVMember" xlink:to="label_EuronextNVMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ElisSAMember" xlink:label="ElisSAMember"/>
					<link:label xlink:type="resource" xlink:label="label_ElisSAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Elis S A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ElisSAMember" xlink:to="label_ElisSAMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ShizuokaFinancialGroupIncMember" xlink:label="ShizuokaFinancialGroupIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ShizuokaFinancialGroupIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Shizuoka Financial Group Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ShizuokaFinancialGroupIncMember" xlink:to="label_ShizuokaFinancialGroupIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_STERISPLCMember" xlink:label="STERISPLCMember"/>
					<link:label xlink:type="resource" xlink:label="label_STERISPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">STERIS PLC [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="STERISPLCMember" xlink:to="label_STERISPLCMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_OktaIncMember" xlink:label="OktaIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_OktaIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Okta Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OktaIncMember" xlink:to="label_OktaIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_CranswickPLCMember" xlink:label="CranswickPLCMember"/>
					<link:label xlink:type="resource" xlink:label="label_CranswickPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Cranswick PLC [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CranswickPLCMember" xlink:to="label_CranswickPLCMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_OBICCoLtdMember" xlink:label="OBICCoLtdMember"/>
					<link:label xlink:type="resource" xlink:label="label_OBICCoLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">OBIC Co Ltd [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OBICCoLtdMember" xlink:to="label_OBICCoLtdMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_TechnipFMCPLCMember" xlink:label="TechnipFMCPLCMember"/>
					<link:label xlink:type="resource" xlink:label="label_TechnipFMCPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">TechnipFMC PLC [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TechnipFMCPLCMember" xlink:to="label_TechnipFMCPLCMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_GFLEnvironmentalIncMember" xlink:label="GFLEnvironmentalIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_GFLEnvironmentalIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">GFL Environmental Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GFLEnvironmentalIncMember" xlink:to="label_GFLEnvironmentalIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MSCIAllCountryWorldIndexNetDivMember" xlink:label="MSCIAllCountryWorldIndexNetDivMember"/>
					<link:label xlink:type="resource" xlink:label="label_MSCIAllCountryWorldIndexNetDivMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MSCI All Country World Index net div [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MSCIAllCountryWorldIndexNetDivMember" xlink:to="label_MSCIAllCountryWorldIndexNetDivMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000124429Member" xlink:label="C000124429Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000124429Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000124429 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000124429Member" xlink:to="label_C000124429Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107824Member" xlink:label="C000107824Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000107824Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000107824 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000107824Member" xlink:to="label_C000107824Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107823Member" xlink:label="C000107823Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000107823Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000107823 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000107823Member" xlink:to="label_C000107823Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107822Member" xlink:label="C000107822Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000107822Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000107822 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000107822Member" xlink:to="label_C000107822Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107821Member" xlink:label="C000107821Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000107821Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000107821 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000107821Member" xlink:to="label_C000107821Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107820Member" xlink:label="C000107820Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000107820Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000107820 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000107820Member" xlink:to="label_C000107820Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107819Member" xlink:label="C000107819Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000107819Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000107819 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000107819Member" xlink:to="label_C000107819Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107818Member" xlink:label="C000107818Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000107818Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000107818 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000107818Member" xlink:to="label_C000107818Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000107817Member" xlink:label="C000107817Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000107817Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000107817 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000107817Member" xlink:to="label_C000107817Member"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US" xlink:label="US"/>
					<link:label xlink:type="resource" xlink:label="label_US" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">UNITED STATES</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="US" xlink:to="label_US"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB" xlink:label="GB"/>
					<link:label xlink:type="resource" xlink:label="label_GB" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">UNITED KINGDOM</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GB" xlink:to="label_GB"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_NO" xlink:label="NO"/>
					<link:label xlink:type="resource" xlink:label="label_NO" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">NORWAY</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NO" xlink:to="label_NO"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP" xlink:label="JP"/>
					<link:label xlink:type="resource" xlink:label="label_JP" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">JAPAN</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="JP" xlink:to="label_JP"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_DE" xlink:label="DE"/>
					<link:label xlink:type="resource" xlink:label="label_DE" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">GERMANY</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="DE" xlink:to="label_DE"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_FR" xlink:label="FR"/>
					<link:label xlink:type="resource" xlink:label="label_FR" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">FRANCE</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FR" xlink:to="label_FR"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA" xlink:label="CA"/>
					<link:label xlink:type="resource" xlink:label="label_CA" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">CANADA</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CA" xlink:to="label_CA"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_BR" xlink:label="BR"/>
					<link:label xlink:type="resource" xlink:label="label_BR" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">BRAZIL</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BR" xlink:to="label_BR"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AU" xlink:label="AU"/>
					<link:label xlink:type="resource" xlink:label="label_AU" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">AUSTRALIA</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AU" xlink:to="label_AU"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN" xlink:label="CN"/>
					<link:label xlink:type="resource" xlink:label="label_CN" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">CHINA</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CN" xlink:to="label_CN"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GR" xlink:label="GR"/>
					<link:label xlink:type="resource" xlink:label="label_GR" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">GREECE</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GR" xlink:to="label_GR"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IN" xlink:label="IN"/>
					<link:label xlink:type="resource" xlink:label="label_IN" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">INDIA</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="IN" xlink:to="label_IN"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_KR" xlink:label="KR"/>
					<link:label xlink:type="resource" xlink:label="label_KR" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">KOREA, REPUBLIC OF</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="KR" xlink:to="label_KR"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX" xlink:label="MX"/>
					<link:label xlink:type="resource" xlink:label="label_MX" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MEXICO</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MX" xlink:to="label_MX"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_ZA" xlink:label="ZA"/>
					<link:label xlink:type="resource" xlink:label="label_ZA" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">SOUTH AFRICA</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ZA" xlink:to="label_ZA"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_TW" xlink:label="TW"/>
					<link:label xlink:type="resource" xlink:label="label_TW" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">TAIWAN</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TW" xlink:to="label_TW"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AE" xlink:label="AE"/>
					<link:label xlink:type="resource" xlink:label="label_AE" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">UNITED ARAB EMIRATES</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AE" xlink:to="label_AE"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000159993Member" xlink:label="C000159993Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000159993Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000159993 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000159993Member" xlink:to="label_C000159993Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000159994Member" xlink:label="C000159994Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000159994Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000159994 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000159994Member" xlink:to="label_C000159994Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000159995Member" xlink:label="C000159995Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000159995Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000159995 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000159995Member" xlink:to="label_C000159995Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000159996Member" xlink:label="C000159996Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000159996Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000159996 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000159996Member" xlink:to="label_C000159996Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000159997Member" xlink:label="C000159997Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000159997Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000159997 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000159997Member" xlink:to="label_C000159997Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000159998Member" xlink:label="C000159998Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000159998Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000159998 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000159998Member" xlink:to="label_C000159998Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000159999Member" xlink:label="C000159999Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000159999Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000159999 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000159999Member" xlink:to="label_C000159999Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160000Member" xlink:label="C000160000Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160000Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160000 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160000Member" xlink:to="label_C000160000Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160001Member" xlink:label="C000160001Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160001Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160001 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160001Member" xlink:to="label_C000160001Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MSCIEmergingMarketsIndexNetDivMember" xlink:label="MSCIEmergingMarketsIndexNetDivMember"/>
					<link:label xlink:type="resource" xlink:label="label_MSCIEmergingMarketsIndexNetDivMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MSCI Emerging Markets Index net div [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MSCIEmergingMarketsIndexNetDivMember" xlink:to="label_MSCIEmergingMarketsIndexNetDivMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_OtherCountriesMember" xlink:label="OtherCountriesMember"/>
					<link:label xlink:type="resource" xlink:label="label_OtherCountriesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Other Countries [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OtherCountriesMember" xlink:to="label_OtherCountriesMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_TaiwanSemiconductorManufacturingCoLtdMember" xlink:label="TaiwanSemiconductorManufacturingCoLtdMember"/>
					<link:label xlink:type="resource" xlink:label="label_TaiwanSemiconductorManufacturingCoLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Taiwan Semiconductor Manufacturing Co Ltd [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TaiwanSemiconductorManufacturingCoLtdMember" xlink:to="label_TaiwanSemiconductorManufacturingCoLtdMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_SamsungElectronicsCoLtdMember" xlink:label="SamsungElectronicsCoLtdMember"/>
					<link:label xlink:type="resource" xlink:label="label_SamsungElectronicsCoLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Samsung Electronics Co Ltd [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SamsungElectronicsCoLtdMember" xlink:to="label_SamsungElectronicsCoLtdMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_SKHynixIncMember" xlink:label="SKHynixIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_SKHynixIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">SK hynix Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SKHynixIncMember" xlink:to="label_SKHynixIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_TencentHoldingsLtdMember" xlink:label="TencentHoldingsLtdMember"/>
					<link:label xlink:type="resource" xlink:label="label_TencentHoldingsLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Tencent Holdings Ltd [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TencentHoldingsLtdMember" xlink:to="label_TencentHoldingsLtdMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ChinaConstructionBankCorpMember" xlink:label="ChinaConstructionBankCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_ChinaConstructionBankCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">China Construction Bank Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChinaConstructionBankCorpMember" xlink:to="label_ChinaConstructionBankCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_HonHaiPrecisionIndustryCoLtdMember" xlink:label="HonHaiPrecisionIndustryCoLtdMember"/>
					<link:label xlink:type="resource" xlink:label="label_HonHaiPrecisionIndustryCoLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Hon Hai Precision Industry Co Ltd [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="HonHaiPrecisionIndustryCoLtdMember" xlink:to="label_HonHaiPrecisionIndustryCoLtdMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_SamsungElectronicsCoLtdTopHoldingMember" xlink:label="SamsungElectronicsCoLtdTopHoldingMember"/>
					<link:label xlink:type="resource" xlink:label="label_SamsungElectronicsCoLtdTopHoldingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Samsung Electronics Co Ltd Top Holding [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SamsungElectronicsCoLtdTopHoldingMember" xlink:to="label_SamsungElectronicsCoLtdTopHoldingMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MediaTekIncMember" xlink:label="MediaTekIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_MediaTekIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MediaTek Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MediaTekIncMember" xlink:to="label_MediaTekIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_KBFinancialGroupIncMember" xlink:label="KBFinancialGroupIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_KBFinancialGroupIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">KB Financial Group Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="KBFinancialGroupIncMember" xlink:to="label_KBFinancialGroupIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_AlibabaGroupHoldingLtdMember" xlink:label="AlibabaGroupHoldingLtdMember"/>
					<link:label xlink:type="resource" xlink:label="label_AlibabaGroupHoldingLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Alibaba Group Holding Ltd [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AlibabaGroupHoldingLtdMember" xlink:to="label_AlibabaGroupHoldingLtdMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_INGGroepNVMember" xlink:label="INGGroepNVMember"/>
					<link:label xlink:type="resource" xlink:label="label_INGGroepNVMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ING Groep N V [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="INGGroepNVMember" xlink:to="label_INGGroepNVMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_UBSGroupAGMember" xlink:label="UBSGroupAGMember"/>
					<link:label xlink:type="resource" xlink:label="label_UBSGroupAGMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">UBS Group AG [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="UBSGroupAGMember" xlink:to="label_UBSGroupAGMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_BancoBilbaoVizcayaArgentariaSAMember" xlink:label="BancoBilbaoVizcayaArgentariaSAMember"/>
					<link:label xlink:type="resource" xlink:label="label_BancoBilbaoVizcayaArgentariaSAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Banco Bilbao Vizcaya Argentaria S A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BancoBilbaoVizcayaArgentariaSAMember" xlink:to="label_BancoBilbaoVizcayaArgentariaSAMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_NovartisAGMember" xlink:label="NovartisAGMember"/>
					<link:label xlink:type="resource" xlink:label="label_NovartisAGMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Novartis AG [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NovartisAGMember" xlink:to="label_NovartisAGMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_BNPParibasSAMember" xlink:label="BNPParibasSAMember"/>
					<link:label xlink:type="resource" xlink:label="label_BNPParibasSAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">BNP Paribas S A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BNPParibasSAMember" xlink:to="label_BNPParibasSAMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_ASMLHoldingNVMember" xlink:label="ASMLHoldingNVMember"/>
					<link:label xlink:type="resource" xlink:label="label_ASMLHoldingNVMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ASML Holding N V [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ASMLHoldingNVMember" xlink:to="label_ASMLHoldingNVMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_TaiwanSemiconductorManufacturingCoLtdADRMember" xlink:label="TaiwanSemiconductorManufacturingCoLtdADRMember"/>
					<link:label xlink:type="resource" xlink:label="label_TaiwanSemiconductorManufacturingCoLtdADRMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TaiwanSemiconductorManufacturingCoLtdADRMember" xlink:to="label_TaiwanSemiconductorManufacturingCoLtdADRMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_MSCIAllCountryWorldExUSIndexNetDivMember" xlink:label="MSCIAllCountryWorldExUSIndexNetDivMember"/>
					<link:label xlink:type="resource" xlink:label="label_MSCIAllCountryWorldExUSIndexNetDivMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MSCI All Country World ex US Index net div [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MSCIAllCountryWorldExUSIndexNetDivMember" xlink:to="label_MSCIAllCountryWorldExUSIndexNetDivMember"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160019Member" xlink:label="C000160019Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160019Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160019 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160019Member" xlink:to="label_C000160019Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160018Member" xlink:label="C000160018Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160018Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160018 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160018Member" xlink:to="label_C000160018Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160017Member" xlink:label="C000160017Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160017Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160017 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160017Member" xlink:to="label_C000160017Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160016Member" xlink:label="C000160016Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160016Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160016 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160016Member" xlink:to="label_C000160016Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160015Member" xlink:label="C000160015Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160015Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160015 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160015Member" xlink:to="label_C000160015Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160014Member" xlink:label="C000160014Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160014Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160014 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160014Member" xlink:to="label_C000160014Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160013Member" xlink:label="C000160013Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160013Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160013 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160013Member" xlink:to="label_C000160013Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160012Member" xlink:label="C000160012Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160012Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160012 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160012Member" xlink:to="label_C000160012Member"/>
					<link:loc xlink:type="locator" xlink:href="#mstiv_C000160011Member" xlink:label="C000160011Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000160011Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000160011 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000160011Member" xlink:to="label_C000160011Member"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CH" xlink:label="CH"/>
					<link:label xlink:type="resource" xlink:label="label_CH" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">SWITZERLAND</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CH" xlink:to="label_CH"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_NL" xlink:label="NL"/>
					<link:label xlink:type="resource" xlink:label="label_NL" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">NETHERLANDS</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NL" xlink:to="label_NL"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis" xlink:label="InvestmentTypeAxis"/>
					<link:label xlink:type="resource" xlink:label="label_InvestmentTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Investment Type [Axis]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="InvestmentTypeAxis" xlink:to="label_InvestmentTypeAxis" priority="1"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet" xlink:label="AssetsNet"/>
					<link:label xlink:type="resource" xlink:label="label_AssetsNet" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Net Assets</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AssetsNet" xlink:to="label_AssetsNet" priority="1"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentCompanyPortfolioTurnover" xlink:label="InvestmentCompanyPortfolioTurnover"/>
					<link:label xlink:type="resource" xlink:label="label_InvestmentCompanyPortfolioTurnover" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Investment Company Portfolio Turnover</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="InvestmentCompanyPortfolioTurnover" xlink:to="label_InvestmentCompanyPortfolioTurnover" priority="1"/>                
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_NoTradingSymbolFlag" xlink:label="dei_NoTradingSymbolFlag"/>
					<link:label xlink:type="resource" xlink:label="label_NoTradingSymbolFlag" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">No Trading Symbol Flag</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_NoTradingSymbolFlag" xlink:to="label_NoTradingSymbolFlag" priority="1"/>		
				</link:labelLink>
			</link:linkbase>
		</appinfo>
	</annotation>   
	<element name="AxonEnterpriseIncMember" id="mstiv_AxonEnterpriseIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="RobinhoodMarketsIncMember" id="mstiv_RobinhoodMarketsIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="TakeTwoInteractiveSoftwareIncMember" id="mstiv_TakeTwoInteractiveSoftwareIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="RevolutionMedicinesIncMember" id="mstiv_RevolutionMedicinesIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="AscendisPharmaASADRMember" id="mstiv_AscendisPharmaASADRMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="MonolithicPowerSystemsIncMember" id="mstiv_MonolithicPowerSystemsIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="SnowflakeIncAMember" id="mstiv_SnowflakeIncAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="CloudflareIncAMember" id="mstiv_CloudflareIncAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="LiveNationEntertainmentIncMember" id="mstiv_LiveNationEntertainmentIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="NateraIncMember" id="mstiv_NateraIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="RussellMidcapGrowthIndexMember" id="mstiv_RussellMidcapGrowthIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="Russell3000IndexMember" id="mstiv_Russell3000IndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000124428Member" id="mstiv_C000124428Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006505Member" id="mstiv_C000006505Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006516Member" id="mstiv_C000006516Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006515Member" id="mstiv_C000006515Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006513Member" id="mstiv_C000006513Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006511Member" id="mstiv_C000006511Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006510Member" id="mstiv_C000006510Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006509Member" id="mstiv_C000006509Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006504Member" id="mstiv_C000006504Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000006517Member" id="mstiv_C000006517Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember" id="mstiv_USTreasuryAndUSGovernmentAgencySecuritiesAndEquivalentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember" id="mstiv_RepurchaseAgreementsCollateralizedByUSTreasuryAndOrUSGovernmentAgencySecuritiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ZeroTo7DaysMember" id="mstiv_ZeroTo7DaysMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="EightTo29DaysMember" id="mstiv_EightTo29DaysMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ThirtyTo59DaysMember" id="mstiv_ThirtyTo59DaysMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="SixtyTo89DaysMember" id="mstiv_SixtyTo89DaysMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="NinetyTo365DaysMember" id="mstiv_NinetyTo365DaysMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="AOnePlusMember" id="mstiv_AOnePlusMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="AOneMember" id="mstiv_AOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="MSCIAllCountryWorldSmallMidCapIndexNetDivMember" id="mstiv_MSCIAllCountryWorldSmallMidCapIndexNetDivMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="CharlesRiverLaboratoriesInternationalIncMember" id="mstiv_CharlesRiverLaboratoriesInternationalIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="EuronextNVMember" id="mstiv_EuronextNVMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ElisSAMember" id="mstiv_ElisSAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ShizuokaFinancialGroupIncMember" id="mstiv_ShizuokaFinancialGroupIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="STERISPLCMember" id="mstiv_STERISPLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="OktaIncMember" id="mstiv_OktaIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="CranswickPLCMember" id="mstiv_CranswickPLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="OBICCoLtdMember" id="mstiv_OBICCoLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="TechnipFMCPLCMember" id="mstiv_TechnipFMCPLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="GFLEnvironmentalIncMember" id="mstiv_GFLEnvironmentalIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="MSCIAllCountryWorldIndexNetDivMember" id="mstiv_MSCIAllCountryWorldIndexNetDivMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000124429Member" id="mstiv_C000124429Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000107824Member" id="mstiv_C000107824Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000107823Member" id="mstiv_C000107823Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000107822Member" id="mstiv_C000107822Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000107821Member" id="mstiv_C000107821Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000107820Member" id="mstiv_C000107820Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000107819Member" id="mstiv_C000107819Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000107818Member" id="mstiv_C000107818Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000107817Member" id="mstiv_C000107817Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000159993Member" id="mstiv_C000159993Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000159994Member" id="mstiv_C000159994Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000159995Member" id="mstiv_C000159995Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000159996Member" id="mstiv_C000159996Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000159997Member" id="mstiv_C000159997Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000159998Member" id="mstiv_C000159998Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000159999Member" id="mstiv_C000159999Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160000Member" id="mstiv_C000160000Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160001Member" id="mstiv_C000160001Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="MSCIEmergingMarketsIndexNetDivMember" id="mstiv_MSCIEmergingMarketsIndexNetDivMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="OtherCountriesMember" id="mstiv_OtherCountriesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="TaiwanSemiconductorManufacturingCoLtdMember" id="mstiv_TaiwanSemiconductorManufacturingCoLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="SamsungElectronicsCoLtdMember" id="mstiv_SamsungElectronicsCoLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="SKHynixIncMember" id="mstiv_SKHynixIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="TencentHoldingsLtdMember" id="mstiv_TencentHoldingsLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ChinaConstructionBankCorpMember" id="mstiv_ChinaConstructionBankCorpMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="HonHaiPrecisionIndustryCoLtdMember" id="mstiv_HonHaiPrecisionIndustryCoLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="SamsungElectronicsCoLtdTopHoldingMember" id="mstiv_SamsungElectronicsCoLtdTopHoldingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="MediaTekIncMember" id="mstiv_MediaTekIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="KBFinancialGroupIncMember" id="mstiv_KBFinancialGroupIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="AlibabaGroupHoldingLtdMember" id="mstiv_AlibabaGroupHoldingLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="INGGroepNVMember" id="mstiv_INGGroepNVMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="UBSGroupAGMember" id="mstiv_UBSGroupAGMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="BancoBilbaoVizcayaArgentariaSAMember" id="mstiv_BancoBilbaoVizcayaArgentariaSAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="NovartisAGMember" id="mstiv_NovartisAGMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="BNPParibasSAMember" id="mstiv_BNPParibasSAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ASMLHoldingNVMember" id="mstiv_ASMLHoldingNVMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="TaiwanSemiconductorManufacturingCoLtdADRMember" id="mstiv_TaiwanSemiconductorManufacturingCoLtdADRMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="MSCIAllCountryWorldExUSIndexNetDivMember" id="mstiv_MSCIAllCountryWorldExUSIndexNetDivMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160019Member" id="mstiv_C000160019Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160018Member" id="mstiv_C000160018Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160017Member" id="mstiv_C000160017Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160016Member" id="mstiv_C000160016Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160015Member" id="mstiv_C000160015Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160014Member" id="mstiv_C000160014Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160013Member" id="mstiv_C000160013Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160012Member" id="mstiv_C000160012Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000160011Member" id="mstiv_C000160011Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
</schema>
