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  <xs:element id="lsta_CollaborativeArrangementRightsAndObligationsAnnualLicenseMaintenanceFee" abstract="false" name="CollaborativeArrangementRightsAndObligationsAnnualLicenseMaintenanceFee" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lsta_CollaborativeArrangementRightsAndObligationsAnnualLicenseMaintenanceFeeStartingAtYearSeven" abstract="false" name="CollaborativeArrangementRightsAndObligationsAnnualLicenseMaintenanceFeeStartingAtYearSeven" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lsta_CollaborativeArrangementRightsAndObligationsMaximumAggregateMilestonePaymentsPerProduct" abstract="false" name="CollaborativeArrangementRightsAndObligationsMaximumAggregateMilestonePaymentsPerProduct" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lsta_CollaborativeArrangementRightsAndObligationsRoyaltiesNetOfSales" abstract="false" name="CollaborativeArrangementRightsAndObligationsRoyaltiesNetOfSales" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lsta_CollaborativeArrangementRightsAndObligationsSublicensingFees" abstract="false" name="CollaborativeArrangementRightsAndObligationsSublicensingFees" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lsta_SharesHeldByThirdParty" abstract="false" name="SharesHeldByThirdParty" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="lsta_ExclusiveLicenseAndCollaborationAgreementMember" abstract="true" name="ExclusiveLicenseAndCollaborationAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lsta_QiluMember" abstract="true" name="QiluMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lsta_KuvaMember" abstract="true" name="KuvaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lsta_RevenueRemainingPerformanceObligationVariableConsiderationAmount" abstract="false" name="RevenueRemainingPerformanceObligationVariableConsiderationAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lsta_RevenuePerformanceObligationPercentageOfNetSale" abstract="false" name="RevenuePerformanceObligationPercentageOfNetSale" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lsta_RevenuePerformanceObligationPercentageOfSublicensingRevenues" abstract="false" name="RevenuePerformanceObligationPercentageOfSublicensingRevenues" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lsta_ResearchCollaborationAndLicenseAgreementOptionToTerminate" abstract="false" name="ResearchCollaborationAndLicenseAgreementOptionToTerminate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
</xs:schema>
