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  <xs:element name="Gtx101Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_Gtx101Member"/>
  <xs:element name="Gtx102Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_Gtx102Member"/>
  <xs:element name="Gtx104Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_Gtx104Member"/>
  <xs:element name="PreFundedWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_PreFundedWarrantsMember"/>
  <xs:element name="PrefundedWarrants2023Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_PrefundedWarrants2023Member"/>
  <xs:element name="PrefundedWarrants2025Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_PrefundedWarrants2025Member"/>
  <xs:element name="PrivatePlacement2025Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_PrivatePlacement2025Member"/>
  <xs:element name="ReportableOperatingSegmentMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_ReportableOperatingSegmentMember"/>
  <xs:element name="September2023CommonWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_September2023CommonWarrantsMember"/>
  <xs:element name="SingleReportableSegmentMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_SingleReportableSegmentMember"/>
  <xs:element name="StockOptionPlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_StockOptionPlanMember"/>
  <xs:element name="TreasuryBillsAndTermDepositsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="grce_TreasuryBillsAndTermDepositsMember"/>
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</xs:schema>
