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<!--Created by Z-K Global Ltd. ("ZKG")-->
<!--produced on 2014-05-08 @ 7:26 AM-->
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  <xsd:element name="AvailableForSaleMarketableSecuritiesNumber" id="psti_AvailableForSaleMarketableSecuritiesNumber" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci" id="psti_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci" id="psti_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember" id="psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType" />
  <xsd:element name="AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember" id="psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType" />
  <xsd:element name="AvailableForSaleSecuritiesMaturesWithinOneYearMember" id="psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType" />
  <xsd:element name="CommonStockAggregateOfferingPriceAuthorized" id="psti_CommonStockAggregateOfferingPriceAuthorized" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="ConsultantRestrictedStockUnitsMember" id="psti_ConsultantRestrictedStockUnitsMember" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType" />
  <xsd:element name="ConsultantsMember" id="psti_ConsultantsMember" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType" />
  <xsd:element name="DocumentAndEntityInformationAbstract" id="psti_DocumentAndEntityInformationAbstract" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element name="EquityOptionsAndWarrantsMember" id="psti_EquityOptionsAndWarrantsMember" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType" />
  <xsd:element name="GeneralAbstract" id="psti_GeneralAbstract" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element name="GovernmentAndThirdPartyGrantsReceived" id="psti_GovernmentAndThirdPartyGrantsReceived" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="GovernmentDebtSecuritiesMember" id="psti_GovernmentDebtSecuritiesMember" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType" />
  <xsd:element name="LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit" id="psti_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="ResearchAndDevelopmentExpensesNet" id="psti_ResearchAndDevelopmentExpensesNet" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="ResearchAndDevelopmentMilestoneRevenueReceivable" id="psti_ResearchAndDevelopmentMilestoneRevenueReceivable" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="RoyaltiesAmountPaidAndAccrued" id="psti_RoyaltiesAmountPaidAndAccrued" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="RoyaltyRatePayableOnGrantsReceived" id="psti_RoyaltyRatePayableOnGrantsReceived" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType" />
  <xsd:element name="RoyaltyRateSales" id="psti_RoyaltyRateSales" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest" id="psti_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised" id="psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsGranted" id="psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsGranted" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumber" id="psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumber" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberExercisable" id="psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberExercisable" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberVestedAndExpectedToVest" id="psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsNumberVestedAndExpectedToVest" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="StockholdersEquityNoteLineItems" id="psti_StockholdersEquityNoteLineItems" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element name="StockholdersEquityNoteTable" id="psti_StockholdersEquityNoteTable" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" />
  <xsd:element name="StockIssuedDuringPeriodSharesStockOptionsAndWarrantsExercised" id="psti_StockIssuedDuringPeriodSharesStockOptionsAndWarrantsExercised" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="StockIssuedDuringPeriodSharesStockWarrantsExercised" id="psti_StockIssuedDuringPeriodSharesStockWarrantsExercised" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" />
  <xsd:element name="StockIssuedDuringPeriodValueStockOptionsAndWarrantsExercised" id="psti_StockIssuedDuringPeriodValueStockOptionsAndWarrantsExercised" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="StockIssuedDuringPeriodValueStockWarrantsExercised" id="psti_StockIssuedDuringPeriodValueStockWarrantsExercised" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="WarrantAwardsMember" id="psti_WarrantAwardsMember" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType" />
  <xsd:element name="WarrantsAndOptionsAggregateIntrinsicValue" id="psti_WarrantsAndOptionsAggregateIntrinsicValue" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="WarrantsAndOptionsAggregateIntrinsicValueExercisable" id="psti_WarrantsAndOptionsAggregateIntrinsicValueExercisable" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="WarrantsAndOptionsAggregateIntrinsicValuePriceAbstract" id="psti_WarrantsAndOptionsAggregateIntrinsicValuePriceAbstract" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element name="WarrantsAndOptionsAggregateIntrinsicValueVestedAndExpectedToVest" id="psti_WarrantsAndOptionsAggregateIntrinsicValueVestedAndExpectedToVest" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element name="WarrantsAndOptionsExercisedWeightedAverageExercisePrice" id="psti_WarrantsAndOptionsExercisedWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType" />
  <xsd:element name="WarrantsAndOptionsGrantedWeightedAverageExercisePrice" id="psti_WarrantsAndOptionsGrantedWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType" />
  <xsd:element name="WarrantsAndOptionsNumberAbstract" id="psti_WarrantsAndOptionsNumberAbstract" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element name="WarrantsAndOptionsWeightedAverageExercisePrice" id="psti_WarrantsAndOptionsWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:perShareItemType" />
  <xsd:element name="WarrantsAndOptionsWeightedAverageExercisePriceAbstract" id="psti_WarrantsAndOptionsWeightedAverageExercisePriceAbstract" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element name="WarrantsAndOptionsWeightedAverageExercisePriceExcercisable" id="psti_WarrantsAndOptionsWeightedAverageExercisePriceExcercisable" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:perShareItemType" />
  <xsd:element name="WarrantsAndOptionsWeightedAverageExercisePriceVestedAndExpectedToVest" id="psti_WarrantsAndOptionsWeightedAverageExercisePriceVestedAndExpectedToVest" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:perShareItemType" />
  <xsd:element name="WarrantsAndOptionsWeightedAverageRemainingContractualTerm" id="psti_WarrantsAndOptionsWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType" />
  <xsd:element name="WarrantsAndOptionsWeightedAverageRemainingContractualTermExercisable" id="psti_WarrantsAndOptionsWeightedAverageRemainingContractualTermExercisable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType" />
  <xsd:element name="WarrantsAndOptionsWeightedAverageRemainingContractualTermsAbstract" id="psti_WarrantsAndOptionsWeightedAverageRemainingContractualTermsAbstract" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element name="WarrantsAndOptionsWeightedAverageRemainingContractualTermVestedAndExpectedToVest" id="psti_WarrantsAndOptionsWeightedAverageRemainingContractualTermVestedAndExpectedToVest" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType" />
  <xsd:element name="WeightedAverageRemainingContractualTermsAbstract" id="psti_WeightedAverageRemainingContractualTermsAbstract" nillable="true" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
</xsd:schema>
