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  <xsd:element id="prpo_HemeScreenReagentRentalMember" name="HemeScreenReagentRentalMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="prpo_AllianceGlobalPartnersMember" name="AllianceGlobalPartnersMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="prpo_AtMarketOfferingMember" name="AtMarketOfferingMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="prpo_SaleOfCommonStockMaximumAggregateSaleProceeds" name="SaleOfCommonStockMaximumAggregateSaleProceeds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="prpo_SaleOfCommonStockAggregateOfferingPriceAuthorized" name="SaleOfCommonStockAggregateOfferingPriceAuthorized" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="prpo_CashFeeAsPercentageOfGrossProceedsOfSaleOfStock" name="CashFeeAsPercentageOfGrossProceedsOfSaleOfStock" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element name="DebtAndLeaseObligationOnDepartmentOfEconomicAndCommunityDevelopment" id="prpo_DebtAndLeaseObligationOnDepartmentOfEconomicAndCommunityDevelopment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="SalesAgreementAmountAvailableForFutureSales" id="prpo_SalesAgreementAmountAvailableForFutureSales" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="Agp2023SalesAgreementMember" id="prpo_Agp2023SalesAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PreFundedWarrantsMember" id="prpo_PreFundedWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RdoCommonWarrantsMember" id="prpo_RdoCommonWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ClassOfWarrantOrRightWarrantsIssued" id="prpo_ClassOfWarrantOrRightWarrantsIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="WarrantsPeriodAfterIssuanceInWhichWarrantsCanBeExercised" id="prpo_WarrantsPeriodAfterIssuanceInWhichWarrantsCanBeExercised" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="RegisteredDirectOfferingMember" id="prpo_RegisteredDirectOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="WarrantsThresholdBeneficialOwnershipPercentageWithItsAffiliates" id="prpo_WarrantsThresholdBeneficialOwnershipPercentageWithItsAffiliates" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="WarrantsThresholdBeneficialOwnershipPercentageAtElectionOfPurchaser" id="prpo_WarrantsThresholdBeneficialOwnershipPercentageAtElectionOfPurchaser" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="WarrantsThresholdBeneficialOwnership" id="prpo_WarrantsThresholdBeneficialOwnership" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="WarrantsNoticePeriodToAlterBeneficialOwnershipPercentage" id="prpo_WarrantsNoticePeriodToAlterBeneficialOwnershipPercentage" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ProceedsFromIssuanceOfCommonStockGross" id="prpo_ProceedsFromIssuanceOfCommonStockGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PurchaseAgreementSaleByExecutivesLockInPeriod" id="prpo_PurchaseAgreementSaleByExecutivesLockInPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PurchaseAgreementThresholdResaleRegistrationPeriod" id="prpo_PurchaseAgreementThresholdResaleRegistrationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PaymentsToFinancialAdvisor" id="prpo_PaymentsToFinancialAdvisor" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PurchaseAgreementSaleLockInPeriod" id="prpo_PurchaseAgreementSaleLockInPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PurchaseAgreementVariableRateTransactionLockInPeriod" id="prpo_PurchaseAgreementVariableRateTransactionLockInPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
</xsd:schema>
