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<!-- Generated by DFIN XBRL Schema Document - http://www.dfinsolutions.com/ - on 25-06-2026 02:10:09 AM -->
<!-- Copyright(c) 2026 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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					<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="25.0" />
					<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="26.0" />
					<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="27.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_WA" xlink:label="WA"/>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_TX" xlink:label="TX"/>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_NY" xlink:label="NY"/>
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					<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"/>
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					<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="5.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CommunicationsSectorMember" xlink:label="CommunicationsSectorMember"/>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ConsumerDiscretionarySectorMember" xlink:label="ConsumerDiscretionarySectorMember"/>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ConsumerStaplesSectorMember" xlink:label="ConsumerStaplesSectorMember"/>
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					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="AMember" order="7.0" />
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					<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"/>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MoodysCRatingMember" xlink:label="MoodysCRatingMember"/>
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					<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"/>
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					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ExternalCreditRatingStandardPoorsMember" xlink:to="StandardPoorsBBBPlusRatingMember" order="2.0" />
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					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ExternalCreditRatingStandardPoorsMember" xlink:to="StandardPoorsAMinusRatingMember" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsARatingMember" xlink:label="StandardPoorsARatingMember"/>
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					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds425111534Member" order="150.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds400021534Member" xlink:label="USTreasuryNotesBonds400021534Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds400021534Member" order="151.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds388081534Member" xlink:label="USTreasuryNotesBonds388081534Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds388081534Member" order="152.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds338051544Member" xlink:label="USTreasuryNotesBonds338051544Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds338051544Member" order="153.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds300111544Member" xlink:label="USTreasuryNotesBonds300111544Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds300111544Member" order="154.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds363021544Member" xlink:label="USTreasuryNotesBonds363021544Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds363021544Member" order="155.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds313081544Member" xlink:label="USTreasuryNotesBonds313081544Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds313081544Member" order="156.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds413081544Member" xlink:label="USTreasuryNotesBonds413081544Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds413081544Member" order="157.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds450021544Member" xlink:label="USTreasuryNotesBonds450021544Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds450021544Member" order="158.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds463111544Member" xlink:label="USTreasuryNotesBonds463111544Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds463111544Member" order="159.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds463051544Member" xlink:label="USTreasuryNotesBonds463051544Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds463051544Member" order="160.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds463051554Member" xlink:label="USTreasuryNotesBonds463051554Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds463051554Member" order="161.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds450111554Member" xlink:label="USTreasuryNotesBonds450111554Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds450111554Member" order="162.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds425081554Member" xlink:label="USTreasuryNotesBonds425081554Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds425081554Member" order="163.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USTreasuryNotesBonds425021554Member" xlink:label="USTreasuryNotesBonds425021554Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="USTreasuryNotesBonds425021554Member" order="164.0"/>
				</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_USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:label="USGovernmentCorporationsAndAgenciesSecuritiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentCorporationsAndAgenciesSecuritiesMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ForeignGovernmentObligationsMember" xlink:label="ForeignGovernmentObligationsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ForeignGovernmentObligationsMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CorporateBondsAndNotesMember" xlink:label="CorporateBondsAndNotesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="CorporateBondsAndNotesMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MunicipalDebtObligationsMember" xlink:label="MunicipalDebtObligationsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MunicipalDebtObligationsMember" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FloatingRateLoanInterestsMember" xlink:label="FloatingRateLoanInterestsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="FloatingRateLoanInterestsMember" order="5.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ShortTermAndOtherAssetsMember" xlink:label="ShortTermAndOtherAssetsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ShortTermAndOtherAssetsMember" order="6.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestmentsMember" xlink:label="ShortTermInvestmentsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ShortTermInvestmentsMember" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_InvestmentCompaniesMember" xlink:label="InvestmentCompaniesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="InvestmentCompaniesMember" order="8.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_OptionsWrittenMember" xlink:label="OptionsWrittenMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="OptionsWrittenMember" order="9.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_OtherAssetsLessLiabilitiesMember" xlink:label="OtherAssetsLessLiabilitiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="OtherAssetsLessLiabilitiesMember" order="10.0"/>
				</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: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: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="#ist_MoreThan40YearsMember" xlink:label="MoreThan40YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="MoreThan40YearsMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ThirtyFiveTo40YearsMember" xlink:label="ThirtyFiveTo40YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="ThirtyFiveTo40YearsMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ThirtyTo35YearsMember" xlink:label="ThirtyTo35YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="ThirtyTo35YearsMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TwentyFiveTo30YearsMember" xlink:label="TwentyFiveTo30YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="TwentyFiveTo30YearsMember" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TwentyTo25YearsMember" xlink:label="TwentyTo25YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="TwentyTo25YearsMember" order="5.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FiveTo10YearsMember" xlink:label="FiveTo10YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="FiveTo10YearsMember" order="6.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TenTo15YearsMember" xlink:label="TenTo15YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="TenTo15YearsMember" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FifteenTo20YearsMember" xlink:label="FifteenTo20YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="FifteenTo20YearsMember" order="8.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MoreThan20YearsMember" xlink:label="MoreThan20YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="MoreThan20YearsMember" order="9.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_OneTo5YearsMember" xlink:label="OneTo5YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="OneTo5YearsMember" order="10.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SixTo7YearsMember" xlink:label="SixTo7YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="SixTo7YearsMember" order="11.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FiveTo6YearsMember" xlink:label="FiveTo6YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="FiveTo6YearsMember" order="12.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FourTo5YearsMember" xlink:label="FourTo5YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="FourTo5YearsMember" order="13.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ZeroTo1YearMember" xlink:label="ZeroTo1YearMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="ZeroTo1YearMember" order="14.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ThreeTo4YearsMember" xlink:label="ThreeTo4YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="ThreeTo4YearsMember" order="15.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TwoTo3YearsMember" xlink:label="TwoTo3YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="TwoTo3YearsMember" order="16.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_OneTo2YearsMember" xlink:label="OneTo2YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="OneTo2YearsMember" order="17.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ZeroTo1YearsMember" xlink:label="ZeroTo1YearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="ZeroTo1YearsMember" order="18.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FifteenToTwentyYearsMember" xlink:label="FifteenToTwentyYearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="FifteenToTwentyYearsMember" order="19.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TwentyToTwentyFiveYearsMember" xlink:label="TwentyToTwentyFiveYearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="TwentyToTwentyFiveYearsMember" order="20.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TwentyFiveToThirtyYearsMember" xlink:label="TwentyFiveToThirtyYearsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MaturityDomain" xlink:to="TwentyFiveToThirtyYearsMember" order="21.0"/>
				</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="#ist_NotRatedMember" xlink:label="NotRatedMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="NotRatedMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CaaMember" xlink:label="CaaMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="CaaMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BMember" xlink:label="BMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="BMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BaMember" xlink:label="BaMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="BaMember" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BaaMember" xlink:label="BaaMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="BaaMember" order="5.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AMember" xlink:label="AMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="AMember" order="6.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AaMember" xlink:label="AaMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="AaMember" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CaMember" xlink:label="CaMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="CaMember" order="8.0"/>
				</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:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_WA" xlink:label="WA"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicRegionDomain" xlink:to="WA" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_TX" xlink:label="TX"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicRegionDomain" xlink:to="TX" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_OH" xlink:label="OH"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicRegionDomain" xlink:to="OH" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_NC" xlink:label="NC"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicRegionDomain" xlink:to="NC" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_NY" xlink:label="NY"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicRegionDomain" xlink:to="NY" order="5.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_MD" xlink:label="MD"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicRegionDomain" xlink:to="MD" order="6.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_FL" xlink:label="FL"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicRegionDomain" xlink:to="FL" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_CT" xlink:label="CT"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicRegionDomain" xlink:to="CT" order="8.0"/>
				</link:definitionLink>
				<link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MoodysCaRatingMember" xlink:label="MoodysCaRatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_MoodysCaRatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Moody&apos;s, Ca Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MoodysCaRatingMember" xlink:to="label_MoodysCaRatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_SA" xlink:label="SA"/>
					<link:label xlink:type="resource" xlink:label="label_SA" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">SAUDI ARABIA</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SA" xlink:to="label_SA"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_PL" xlink:label="PL"/>
					<link:label xlink:type="resource" xlink:label="label_PL" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">POLAND</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PL" xlink:to="label_PL"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_PH" xlink:label="PH"/>
					<link:label xlink:type="resource" xlink:label="label_PH" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">PHILIPPINES</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PH" xlink:to="label_PH"/>
					<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_ID" xlink:label="ID"/>
					<link:label xlink:type="resource" xlink:label="label_ID" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">INDONESIA</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ID" xlink:to="label_ID"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HU" xlink:label="HU"/>
					<link:label xlink:type="resource" xlink:label="label_HU" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">HUNGARY</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="HU" xlink:to="label_HU"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_DO" xlink:label="DO"/>
					<link:label xlink:type="resource" xlink:label="label_DO" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">DOMINICAN REPUBLIC</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="DO" xlink:to="label_DO"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CL" xlink:label="CL"/>
					<link:label xlink:type="resource" xlink:label="label_CL" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">CHILE</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CL" xlink:to="label_CL"/>
					<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_AT" xlink:label="AT"/>
					<link:label xlink:type="resource" xlink:label="label_AT" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">AUSTRIA</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AT" xlink:to="label_AT"/>
					<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_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_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_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_IT" xlink:label="IT"/>
					<link:label xlink:type="resource" xlink:label="label_IT" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ITALY</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="IT" xlink:to="label_IT"/>
					<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_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.sec.gov/country/2025/country-2025.xsd#country_ES" xlink:label="ES"/>
					<link:label xlink:type="resource" xlink:label="label_ES" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">SPAIN</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ES" xlink:to="label_ES"/>
					<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.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MoodysAaaRatingMember" xlink:label="MoodysAaaRatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_MoodysAaaRatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Moody&apos;s, Aaa Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MoodysAaaRatingMember" xlink:to="label_MoodysAaaRatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IL" xlink:label="IL"/>
					<link:label xlink:type="resource" xlink:label="label_IL" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ISRAEL</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="IL" xlink:to="label_IL"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_BE" xlink:label="BE"/>
					<link:label xlink:type="resource" xlink:label="label_BE" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">BELGIUM</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BE" xlink:to="label_BE"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MoodysCRatingMember" xlink:label="MoodysCRatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_MoodysCRatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Moody&apos;s, C Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MoodysCRatingMember" xlink:to="label_MoodysCRatingMember"/>
					<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="#ist_OtherMember" xlink:label="OtherMember"/>
					<link:label xlink:type="resource" xlink:label="label_OtherMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Other [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OtherMember" xlink:to="label_OtherMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_NotRatedMember" xlink:label="NotRatedMember"/>
					<link:label xlink:type="resource" xlink:label="label_NotRatedMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Not Rated [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NotRatedMember" xlink:to="label_NotRatedMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CaaMember" xlink:label="CaaMember"/>
					<link:label xlink:type="resource" xlink:label="label_CaaMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Caa [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CaaMember" xlink:to="label_CaaMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BMember" xlink:label="BMember"/>
					<link:label xlink:type="resource" xlink:label="label_BMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">B [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BMember" xlink:to="label_BMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BaMember" xlink:label="BaMember"/>
					<link:label xlink:type="resource" xlink:label="label_BaMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Ba [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BaMember" xlink:to="label_BaMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BaaMember" xlink:label="BaaMember"/>
					<link:label xlink:type="resource" xlink:label="label_BaaMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Baa [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BaaMember" xlink:to="label_BaaMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AMember" xlink:label="AMember"/>
					<link:label xlink:type="resource" xlink:label="label_AMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AMember" xlink:to="label_AMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AaMember" xlink:label="AaMember"/>
					<link:label xlink:type="resource" xlink:label="label_AaMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Aa [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AaMember" xlink:to="label_AaMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_TR" xlink:label="TR"/>
					<link:label xlink:type="resource" xlink:label="label_TR" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">T&amp;#220;RKIYE</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TR" xlink:to="label_TR"/>
										<link:label xlink:type="resource" xlink:label="label_TR_2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Turkey</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TR" xlink:to="label_TR_2"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000055529Member" xlink:label="C000055529Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000055529Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000055529 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000055529Member" xlink:to="label_C000055529Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000055529Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Comp</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000055529Member" xlink:to="label_C000055529Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000069477Member" xlink:label="C000069477Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000069477Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000069477 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000069477Member" xlink:to="label_C000069477Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CaMember" xlink:label="CaMember"/>
					<link:label xlink:type="resource" xlink:label="label_CaMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Ca [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CaMember" xlink:to="label_CaMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000069478Member" xlink:label="C000069478Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000069478Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000069478 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000069478Member" xlink:to="label_C000069478Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000102031Member" xlink:label="C000102031Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000102031Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000102031 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000102031Member" xlink:to="label_C000102031Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MoreThan40YearsMember" xlink:label="MoreThan40YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_MoreThan40YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">More than 40 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MoreThan40YearsMember" xlink:to="label_MoreThan40YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ThirtyFiveTo40YearsMember" xlink:label="ThirtyFiveTo40YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_ThirtyFiveTo40YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Thirty Five To 40 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ThirtyFiveTo40YearsMember" xlink:to="label_ThirtyFiveTo40YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ThirtyTo35YearsMember" xlink:label="ThirtyTo35YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_ThirtyTo35YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Thirty To 35 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ThirtyTo35YearsMember" xlink:to="label_ThirtyTo35YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TwentyFiveTo30YearsMember" xlink:label="TwentyFiveTo30YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_TwentyFiveTo30YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Twenty Five To 30 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TwentyFiveTo30YearsMember" xlink:to="label_TwentyFiveTo30YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TwentyTo25YearsMember" xlink:label="TwentyTo25YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_TwentyTo25YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Twenty To 25 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TwentyTo25YearsMember" xlink:to="label_TwentyTo25YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000110079Member" xlink:label="C000110079Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000110079Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000110079 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000110079Member" xlink:to="label_C000110079Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000110080Member" xlink:label="C000110080Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000110080Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000110080 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000110080Member" xlink:to="label_C000110080Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_GovernmentNationalMortgageAssociation200022051Member" xlink:label="GovernmentNationalMortgageAssociation200022051Member"/>
					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation200022051Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 2 00 02 20 51 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation200022051Member" xlink:to="label_GovernmentNationalMortgageAssociation200022051Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_GovernmentNationalMortgageAssociation550102055Member" xlink:label="GovernmentNationalMortgageAssociation550102055Member"/>
					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation550102055Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 5 50 10 20 55 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation550102055Member" xlink:to="label_GovernmentNationalMortgageAssociation550102055Member"/>
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					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation200122051Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 2 00 12 20 51 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation200122051Member" xlink:to="label_GovernmentNationalMortgageAssociation200122051Member"/>
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					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation500052053Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 5 00 05 20 53 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation500052053Member" xlink:to="label_GovernmentNationalMortgageAssociation500052053Member"/>
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					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation500052056Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 5 00 05 20 56 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation500052056Member" xlink:to="label_GovernmentNationalMortgageAssociation500052056Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_GovernmentNationalMortgageAssociation500112054Member" xlink:label="GovernmentNationalMortgageAssociation500112054Member"/>
					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation500112054Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 5 00 11 20 54 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation500112054Member" xlink:to="label_GovernmentNationalMortgageAssociation500112054Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_GovernmentNationalMortgageAssociation550042053Member" xlink:label="GovernmentNationalMortgageAssociation550042053Member"/>
					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation550042053Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 5 50 04 20 53 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation550042053Member" xlink:to="label_GovernmentNationalMortgageAssociation550042053Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_GovernmentNationalMortgageAssociation250072051Member" xlink:label="GovernmentNationalMortgageAssociation250072051Member"/>
					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation250072051Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 2 50 07 20 51 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation250072051Member" xlink:to="label_GovernmentNationalMortgageAssociation250072051Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_GovernmentNationalMortgageAssociation200022052Member" xlink:label="GovernmentNationalMortgageAssociation200022052Member"/>
					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation200022052Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 2 00 02 20 52 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation200022052Member" xlink:to="label_GovernmentNationalMortgageAssociation200022052Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_GovernmentNationalMortgageAssociation450052056Member" xlink:label="GovernmentNationalMortgageAssociation450052056Member"/>
					<link:label xlink:type="resource" xlink:label="label_GovernmentNationalMortgageAssociation450052056Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government National Mortgage Association 4 50 05 20 56 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentNationalMortgageAssociation450052056Member" xlink:to="label_GovernmentNationalMortgageAssociation450052056Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FiveTo10YearsMember" xlink:label="FiveTo10YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_FiveTo10YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Five To 10 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FiveTo10YearsMember" xlink:to="label_FiveTo10YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TenTo15YearsMember" xlink:label="TenTo15YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_TenTo15YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Ten To 15 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TenTo15YearsMember" xlink:to="label_TenTo15YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FifteenTo20YearsMember" xlink:label="FifteenTo20YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_FifteenTo20YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Fifteen To 20 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FifteenTo20YearsMember" xlink:to="label_FifteenTo20YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MoreThan20YearsMember" xlink:label="MoreThan20YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_MoreThan20YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">More than 20 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MoreThan20YearsMember" xlink:to="label_MoreThan20YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_OneTo5YearsMember" xlink:label="OneTo5YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_OneTo5YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">One To 5 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OneTo5YearsMember" xlink:to="label_OneTo5YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AbbVieInc320112129Member" xlink:label="AbbVieInc320112129Member"/>
					<link:label xlink:type="resource" xlink:label="label_AbbVieInc320112129Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">AbbVie Inc 3 20 11 21 29 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AbbVieInc320112129Member" xlink:to="label_AbbVieInc320112129Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc470020136Member" xlink:label="AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc470020136Member"/>
					<link:label xlink:type="resource" xlink:label="label_AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc470020136Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Anheuser Busch Cos LLC Anheuser Busch InBev Worldwide Inc 4 70 02 01 36 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc470020136Member" xlink:to="label_AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc470020136Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_PfizerInvestmentEnterprisesPteLtd530051953Member" xlink:label="PfizerInvestmentEnterprisesPteLtd530051953Member"/>
					<link:label xlink:type="resource" xlink:label="label_PfizerInvestmentEnterprisesPteLtd530051953Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Pfizer Investment Enterprises Pte Ltd 5 30 05 19 53 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PfizerInvestmentEnterprisesPteLtd530051953Member" xlink:to="label_PfizerInvestmentEnterprisesPteLtd530051953Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AmazonComInc580031356Member" xlink:label="AmazonComInc580031356Member"/>
					<link:label xlink:type="resource" xlink:label="label_AmazonComInc580031356Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Amazon com Inc 5 80 03 13 56 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AmazonComInc580031356Member" xlink:to="label_AmazonComInc580031356Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MetaPlatformsInc488111535Member" xlink:label="MetaPlatformsInc488111535Member"/>
					<link:label xlink:type="resource" xlink:label="label_MetaPlatformsInc488111535Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Meta Platforms Inc 4 88 11 15 35 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MetaPlatformsInc488111535Member" xlink:to="label_MetaPlatformsInc488111535Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MetaPlatformsInc563111555Member" xlink:label="MetaPlatformsInc563111555Member"/>
					<link:label xlink:type="resource" xlink:label="label_MetaPlatformsInc563111555Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Meta Platforms Inc 5 63 11 15 55 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MetaPlatformsInc563111555Member" xlink:to="label_MetaPlatformsInc563111555Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BroadcomInc314111535Member" xlink:label="BroadcomInc314111535Member"/>
					<link:label xlink:type="resource" xlink:label="label_BroadcomInc314111535Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Broadcom Inc 3 14 11 15 35 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BroadcomInc314111535Member" xlink:to="label_BroadcomInc314111535Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc490020146Member" xlink:label="AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc490020146Member"/>
					<link:label xlink:type="resource" xlink:label="label_AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc490020146Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Anheuser Busch Cos LLC Anheuser Busch InBev Worldwide Inc 4 90 02 01 46 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc490020146Member" xlink:to="label_AnheuserBuschCosLLCAnheuserBuschInBevWorldwideInc490020146Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BroadcomInc480101534Member" xlink:label="BroadcomInc480101534Member"/>
					<link:label xlink:type="resource" xlink:label="label_BroadcomInc480101534Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Broadcom Inc 4 80 10 15 34 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BroadcomInc480101534Member" xlink:to="label_BroadcomInc480101534Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BroadcomInc490071532Member" xlink:label="BroadcomInc490071532Member"/>
					<link:label xlink:type="resource" xlink:label="label_BroadcomInc490071532Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Broadcom Inc 4 90 07 15 32 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BroadcomInc490071532Member" xlink:to="label_BroadcomInc490071532Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000110081Member" xlink:label="C000110081Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000110081Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000110081 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000110081Member" xlink:to="label_C000110081Member"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedMortgageObligationsMember" xlink:label="CollateralizedMortgageObligationsMember"/>
					<link:label xlink:type="resource" xlink:label="label_CollateralizedMortgageObligationsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Collateralized Mortgage Obligations [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CollateralizedMortgageObligationsMember" xlink:to="label_CollateralizedMortgageObligationsMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:label="USGovernmentCorporationsAndAgenciesSecuritiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">US Government Corporations and Agencies Securities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:to="label_USGovernmentCorporationsAndAgenciesSecuritiesMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember" xlink:label="CommonStockMember"/>
					<link:label xlink:type="resource" xlink:label="label_CommonStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Common Stock [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CommonStockMember" xlink:to="label_CommonStockMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember" xlink:label="AssetBackedSecuritiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_AssetBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Asset-Backed Securities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AssetBackedSecuritiesMember" xlink:to="label_AssetBackedSecuritiesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000119711Member" xlink:label="C000119711Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000119711Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000119711 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000119711Member" xlink:to="label_C000119711Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ForeignGovernmentObligationsMember" xlink:label="ForeignGovernmentObligationsMember"/>
					<link:label xlink:type="resource" xlink:label="label_ForeignGovernmentObligationsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Foreign Government Obligations [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ForeignGovernmentObligationsMember" xlink:to="label_ForeignGovernmentObligationsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CorporateBondsAndNotesMember" xlink:label="CorporateBondsAndNotesMember"/>
					<link:label xlink:type="resource" xlink:label="label_CorporateBondsAndNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Corporate Bonds And Notes [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CorporateBondsAndNotesMember" xlink:to="label_CorporateBondsAndNotesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MunicipalDebtObligationsMember" xlink:label="MunicipalDebtObligationsMember"/>
					<link:label xlink:type="resource" xlink:label="label_MunicipalDebtObligationsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Municipal Debt Obligations [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MunicipalDebtObligationsMember" xlink:to="label_MunicipalDebtObligationsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FloatingRateLoanInterestsMember" xlink:label="FloatingRateLoanInterestsMember"/>
					<link:label xlink:type="resource" xlink:label="label_FloatingRateLoanInterestsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Floating Rate Loan Interests [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FloatingRateLoanInterestsMember" xlink:to="label_FloatingRateLoanInterestsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SixTo7YearsMember" xlink:label="SixTo7YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_SixTo7YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Six To 7 Years [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SixTo7YearsMember" xlink:to="label_SixTo7YearsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FiveTo6YearsMember" xlink:label="FiveTo6YearsMember"/>
					<link:label xlink:type="resource" xlink:label="label_FiveTo6YearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Five To 6 Years [Member]</link:label>
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