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  <xs:element name="ShareBasedCompensationArrangementAnnualIncreaseInNumberOfCommonStockSharesReservedForFutureIssuance" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ShareBasedCompensationArrangementAnnualIncreaseInNumberOfCommonStockSharesReservedForFutureIssuance"/>
  <xs:element name="MaximumAmountOfStockEmployeesEligibleForCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="orka_MaximumAmountOfStockEmployeesEligibleForCompensation"/>
  <xs:element name="NumberOfUnitsConverted" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_NumberOfUnitsConverted"/>
  <xs:element name="FairValueOfRestrictedStockVested" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="orka_FairValueOfRestrictedStockVested"/>
  <xs:element name="ClassOfWarrantOrRightToPurchasePercentageOfOutstandingDilutedStockMaximum" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ClassOfWarrantOrRightToPurchasePercentageOfOutstandingDilutedStockMaximum"/>
  <xs:element name="LicenseAgreementDomainDomain" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_LicenseAgreementDomainDomain"/>
  <xs:element name="OptionAgreementsandLicenseAgreementsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="orka_OptionAgreementsandLicenseAgreementsDetailsTable"/>
  <xs:element name="NonRefundableMilestonePayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="orka_NonRefundableMilestonePayments"/>
  <xs:element name="RoyaltyPayableOnProductSales" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_RoyaltyPayableOnProductSales"/>
  <xs:element name="CommitmentsandContingenciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="orka_CommitmentsandContingenciesDetailsTable"/>
  <xs:element name="NonRefundableLicenseFee" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="orka_NonRefundableLicenseFee"/>
  <xs:element name="NetLossPerShareDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="orka_NetLossPerShareDetailsTable"/>
  <xs:element name="RelatedPartyTransactionsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="orka_RelatedPartyTransactionsDetailsTable"/>
  <xs:element name="DescriptionOfMinorityInterestOwnershipPercentageByNoncontrollingOwners" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_DescriptionOfMinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
  <xs:element name="SubsequentEventsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="orka_SubsequentEventsDetailsTable"/>
  <xs:element name="UnderwritersExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_UnderwritersExpirationDate"/>
  <xs:element name="UpfrontPaymentAndMilestonePaymentsUponTheAchievementOfCertainClinicalDevelopmentalAndSalesMilestones" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="orka_UpfrontPaymentAndMilestonePaymentsUponTheAchievementOfCertainClinicalDevelopmentalAndSalesMilestones"/>
  <xs:element name="ClassOfStocksAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="orka_ClassOfStocksAxis"/>
  <xs:element name="LicenseAgreementAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="orka_LicenseAgreementAxis"/>
  <xs:element name="LocationStatementOfIncomeBalance1Axis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="orka_LocationStatementOfIncomeBalance1Axis"/>
  <xs:element name="MarketableSecuritiesAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="orka_MarketableSecuritiesAxis"/>
  <xs:element name="AllocatedShareBasedCompensationExpenseMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_AllocatedShareBasedCompensationExpenseMember"/>
  <xs:element name="AntibodyProductsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_AntibodyProductsMember"/>
  <xs:element name="AtTheMarketOfferingMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_AtTheMarketOfferingMember"/>
  <xs:element name="August2024IssuanceMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_August2024IssuanceMember"/>
  <xs:element name="ClinicalDevelopmentMilestonesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ClinicalDevelopmentMilestonesMember"/>
  <xs:element name="EmployeeWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_EmployeeWarrantsMember"/>
  <xs:element name="ExternalMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ExternalMember"/>
  <xs:element name="FairmountMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_FairmountMember"/>
  <xs:element name="GeneralAndAdministrativeExpensesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_GeneralAndAdministrativeExpensesMember"/>
  <xs:element name="HyperconLicenseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_HyperconLicenseAgreementMember"/>
  <xs:element name="MarketableSecuritiesCurrentMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_MarketableSecuritiesCurrentMember"/>
  <xs:element name="MarketableSecuritiesLongTermMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_MarketableSecuritiesLongTermMember"/>
  <xs:element name="MarketableSecuritiesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_MarketableSecuritiesMember"/>
  <xs:element name="ORKAZeroZeroOneMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ORKAZeroZeroOneMember"/>
  <xs:element name="ORKAZeroZeroTwoMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ORKAZeroZeroTwoMember"/>
  <xs:element name="OperatingExpenseExcludingPersonnelRelatedAndStockBasedCompensationMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_OperatingExpenseExcludingPersonnelRelatedAndStockBasedCompensationMember"/>
  <xs:element name="OperatingExpenseExcludingStockBasedCompensationMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_OperatingExpenseExcludingStockBasedCompensationMember"/>
  <xs:element name="OptionAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_OptionAgreementMember"/>
  <xs:element name="OtherMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_OtherMember"/>
  <xs:element name="ParagonAndParukaMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ParagonAndParukaMember"/>
  <xs:element name="ParagonMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ParagonMember"/>
  <xs:element name="ParagonMilestonePaymentsForTheOptionAgreementsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ParagonMilestonePaymentsForTheOptionAgreementsMember"/>
  <xs:element name="ParagonReimbursablePatentExpensesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ParagonReimbursablePatentExpensesMember"/>
  <xs:element name="ParagonTherapeuticsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ParagonTherapeuticsMember"/>
  <xs:element name="ParukaMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ParukaMember"/>
  <xs:element name="ParukaWarrantMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ParukaWarrantMember"/>
  <xs:element name="ParukaWarrantObligationMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ParukaWarrantObligationMember"/>
  <xs:element name="PreFundedWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_PreFundedWarrantsMember"/>
  <xs:element name="PrefundedWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_PrefundedWarrantsMember"/>
  <xs:element name="RegulatoryMilestonesMemberMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_RegulatoryMilestonesMemberMember"/>
  <xs:element name="ResearchAndDevelopmentExpensesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_ResearchAndDevelopmentExpensesMember"/>
  <xs:element name="RestrictedStockAwardsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_RestrictedStockAwardsMember"/>
  <xs:element name="September2024IssuanceMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_September2024IssuanceMember"/>
  <xs:element name="September2025IssuanceMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_September2025IssuanceMember"/>
  <xs:element name="SeriesBConvertiblePreferredStockMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_SeriesBConvertiblePreferredStockMember"/>
  <xs:element name="SeriesBNonVotingConvertiblePreferredStockAmountMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_SeriesBNonVotingConvertiblePreferredStockAmountMember"/>
  <xs:element name="StockOptionsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_StockOptionsMember"/>
  <xs:element name="TwoThousandTwentyFourEmployeeStockPurchasePlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_TwoThousandTwentyFourEmployeeStockPurchasePlanMember"/>
  <xs:element name="TwoThousandTwentyFourStockIncentivePlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_TwoThousandTwentyFourStockIncentivePlanMember"/>
  <xs:element name="TwoThousandTwentyFourStocksIncentivePlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_TwoThousandTwentyFourStocksIncentivePlanMember"/>
  <xs:element name="USGovernmentAgencySecuritiesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_USGovernmentAgencySecuritiesMember"/>
  <xs:element name="OptionAgreementsAndLicenseAgreementsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_OptionAgreementsAndLicenseAgreementsAbstract"/>
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  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="orka_DocumentAndEntityInformationAbstract"/>
</xs:schema>
