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    <element id="PMCB_UndistributedIncomeToSeriesBConvertiblePreferredStock" name="UndistributedIncomeToSeriesBConvertiblePreferredStock" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FractionalSharesAdjustmentValue" name="FractionalSharesAdjustmentValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FractionalSharesAdjustmentShares" name="FractionalSharesAdjustmentShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_StockIssuedUponVestingOfRestrictedStockUnits" name="StockIssuedUponVestingOfRestrictedStockUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_StockIssuedUponVestingOfRestrictedStockUnitsShares" name="StockIssuedUponVestingOfRestrictedStockUnitsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IssuanceOfSeriesCPreferredStockAndWarrants" name="IssuanceOfSeriesCPreferredStockAndWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IssuanceOfSeriesCPreferredStockAndWarrantsShares" name="IssuanceOfSeriesCPreferredStockAndWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PreferredStockAccretion" name="PreferredStockAccretion" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_SeriesCPreferredStockRedeemed" name="SeriesCPreferredStockRedeemed" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_SeriesCPreferredStockRedeemedShares" name="SeriesCPreferredStockRedeemedShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_SeriesCPreferredStockSubjectToSettlement" name="SeriesCPreferredStockSubjectToSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_SeriesBPreferredStockRedemption" name="SeriesBPreferredStockRedemption" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_SeriesBPreferredStockRedemptionShares" name="SeriesBPreferredStockRedemptionShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_DeemedDividends" name="DeemedDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IssuanceCostsSeriesCPreferredStockAndWarrants" name="IssuanceCostsSeriesCPreferredStockAndWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_LossOnIssuanceOfSeriesCPreferredStock" name="LossOnIssuanceOfSeriesCPreferredStock" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_GainOnFairValueOfWarrants" name="GainOnFairValueOfWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_NoncashInterestIncome" name="NoncashInterestIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_NoncashWarrantLiability" name="NoncashWarrantLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_StockbasedCompensationOptions" name="StockbasedCompensationOptions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ChangeInFairValueOfConvertibleNotesReceivable" name="ChangeInFairValueOfConvertibleNotesReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ChangeInFairValueOfInvestmentQcls" name="ChangeInFairValueOfInvestmentQcls" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ChangeInFairValueOfWarrantsQcls" name="ChangeInFairValueOfWarrantsQcls" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_InvestmentInPreferredStockAndWarrantsInQcls" name="InvestmentInPreferredStockAndWarrantsInQcls" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ProceedsFromInvestmentNoteReceivable" name="ProceedsFromInvestmentNoteReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_RedemptionOfPreferredStock" name="RedemptionOfPreferredStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PaymentOfSeriesCConvertiblePreferredStockDividends" name="PaymentOfSeriesCConvertiblePreferredStockDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_AccrualOfSeriesCConvertiblePreferredStockDividends" name="AccrualOfSeriesCConvertiblePreferredStockDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_AccretionOfDiscountsToRedemptionValueOfSeriesCPreferredStock" name="AccretionOfDiscountsToRedemptionValueOfSeriesCPreferredStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_InitialFairValueOfInvestmentInQclsSeriesHPreferredShares" name="InitialFairValueOfInvestmentInQclsSeriesHPreferredShares" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_InitialFairValueOfInvestmentInQclsSeriesHWarrants" name="InitialFairValueOfInvestmentInQclsSeriesHWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_NoncashDerivativeLiabilityAtInitialFairValue" name="NoncashDerivativeLiabilityAtInitialFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_NoncashWarrantLiabilityAtInitialFairValue" name="NoncashWarrantLiabilityAtInitialFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_NoncashConversionOfSeriesCConvertibleStock" name="NoncashConversionOfSeriesCConvertibleStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ChangeInFairValueAssociatedWarrantExercises" name="ChangeInFairValueAssociatedWarrantExercises" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FairValueOfContingentlyRedeemablePlacementAgentWarrants" name="FairValueOfContingentlyRedeemablePlacementAgentWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_SeriesBConvertiblePreferredStockDividends" name="SeriesBConvertiblePreferredStockDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_AccretionOfDiscountsToRedemptionValueOfSeriesBConvertiblePreferredStock" name="AccretionOfDiscountsToRedemptionValueOfSeriesBConvertiblePreferredStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ExciseTaxAccruedOnRepurchaseOfCommonStock" name="ExciseTaxAccruedOnRepurchaseOfCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_DisclosureLiquidityAndOtherUncertaintiesAbstract" name="DisclosureLiquidityAndOtherUncertaintiesAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_LiquidityAndOtherUncertainitiesTextBlock" name="LiquidityAndOtherUncertainitiesTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantsAndPreferredSharesPolicyTextBlock" name="WarrantsAndPreferredSharesPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_RedeemablePreferredStockPolicyTextBlock" name="RedeemablePreferredStockPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_RecentlyAdoptedAccountingPronouncementsPolicyTextBlock" name="RecentlyAdoptedAccountingPronouncementsPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_InterestPaidInShares" name="InterestPaidInShares" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_DisclosureTable" name="DisclosureTable" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" />
    <element id="PMCB_DisclosureLineitem" name="DisclosureLineitem" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_InitialFairValueOfInvestment" name="InitialFairValueOfInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ReceivableInstrumentConvertibleConversionPrice1" name="ReceivableInstrumentConvertibleConversionPrice1" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_StockReceivedForSettlementOfInterestReceivable" name="StockReceivedForSettlementOfInterestReceivable" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_InterestReceivableSettledForStock" name="InterestReceivableSettledForStock" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_InvestmentSharesAddition" name="InvestmentSharesAddition" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_InvestmentSharesReceived" name="InvestmentSharesReceived" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantsIssuedShares" name="WarrantsIssuedShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantExercised" name="WarrantExercised" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageExercisePriceWarrantsExercised" name="WeightedAverageExercisePriceWarrantsExercised" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantsExpired" name="WarrantsExpired" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageExercisePriceWarrantsExpired" name="WeightedAverageExercisePriceWarrantsExpired" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantsExercisable" name="WarrantsExercisable" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageExercisePriceWarrantsExercisable" name="WeightedAverageExercisePriceWarrantsExercisable" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IssuanceFairValues" name="IssuanceFairValues" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantsIssuedValue" name="WarrantsIssuedValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PaymentsForLegalSettlement" name="PaymentsForLegalSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IncomeTaxReconciliationNondeductibleExpenseFairValueOfWarrantLiability" name="IncomeTaxReconciliationNondeductibleExpenseFairValueOfWarrantLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IncomeTaxReconciliationNondeductibleExpenseGainOnRelatedPartyInvestment" name="IncomeTaxReconciliationNondeductibleExpenseGainOnRelatedPartyInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IncomeTaxReconciliationNondeductibleExpenseFairValueOfDerivativeLiability" name="IncomeTaxReconciliationNondeductibleExpenseFairValueOfDerivativeLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IncomeTaxReconciliationRedemptionOfDerivativeLiability" name="IncomeTaxReconciliationRedemptionOfDerivativeLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IncomeTaxReconciliationExpirationOfWarrantAsset" name="IncomeTaxReconciliationExpirationOfWarrantAsset" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IncomeTaxReconciliationNondeductibleExpenseLegalSettlement" name="IncomeTaxReconciliationNondeductibleExpenseLegalSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IncomeTaxReconciliationFairValueOfWarrantAsset" name="IncomeTaxReconciliationFairValueOfWarrantAsset" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_DeferredTaxAssetsIntangibleAsset" name="DeferredTaxAssetsIntangibleAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_DeferredTaxAssetsFairValueOfWarrantAsset" name="DeferredTaxAssetsFairValueOfWarrantAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_DeferredTaxLiabilitiesConvertibleNoteReceivable" name="DeferredTaxLiabilitiesConvertibleNoteReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_DeferredTaxLiabilitiesFairValueOfInvestmentInQCLS" name="DeferredTaxLiabilitiesFairValueOfInvestmentInQCLS" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_LessAllocationOfUndistributedIncome" name="LessAllocationOfUndistributedIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PreferredStockSharesDesignated" name="PreferredStockSharesDesignated" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ExcludedSubjectToRedemptionValue" name="ExcludedSubjectToRedemptionValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PreferredStockParValuePerShare" name="PreferredStockParValuePerShare" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PreferredStockStatedValuePerShare" name="PreferredStockStatedValuePerShare" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PlacementAgentFeePercentage" name="PlacementAgentFeePercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PreferredStockDiscount" name="PreferredStockDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FairValueEmbeddedDerivative" name="FairValueEmbeddedDerivative" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantLiabilityFairValue" name="WarrantLiabilityFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_DeemedDividend" name="DeemedDividend" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ChangeInFairValueDerivativeLiability" name="ChangeInFairValueDerivativeLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantExercises" name="WarrantExercises" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FairValueNetEmbeddedDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues" name="FairValueNetEmbeddedDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_CashPremiumMember" name="CashPremiumMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
</schema>
