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  <xs:element id="ibrx_RevenueInterestPurchaseAgreementPaymentsPercentageOfNetSales" abstract="false" name="RevenueInterestPurchaseAgreementPaymentsPercentageOfNetSales" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
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  <xs:element id="ibrx_RevenueInterestPurchaseAgreementPaymentReceivedPercentage" abstract="false" name="RevenueInterestPurchaseAgreementPaymentReceivedPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
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  <xs:element id="ibrx_SaleOfStockAndRevenueInterestPurchaseAgreementConsiderationReceivedOnTransaction" abstract="false" name="SaleOfStockAndRevenueInterestPurchaseAgreementConsiderationReceivedOnTransaction" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="ibrx_February2023ShelfRegistrationStatementMember" abstract="true" name="February2023ShelfRegistrationStatementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
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  <xs:element id="ibrx_SaleOfStockOfferingAmountAvailableForFutureIssuance" abstract="false" name="SaleOfStockOfferingAmountAvailableForFutureIssuance" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="ibrx_TwoThousandFifteenEquityIncentivePlanMember" abstract="true" name="TwoThousandFifteenEquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="ibrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesThatMayBeCarriedOverToASubsequentPlan" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesThatMayBeCarriedOverToASubsequentPlan" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
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</xs:schema>
