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  <xsd:element name="ExpectedProceedsFromIssuanceOrSaleOfEquity" id="astm_ExpectedProceedsFromIssuanceOrSaleOfEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfGrossProceedsPayableAsCommission" id="astm_PercentageOfGrossProceedsPayableAsCommission" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="McNicollLewisAndVlakLLCMember" id="astm_McNicollLewisAndVlakLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightAdditionalNumberOfRightsDistributedPerCommonShare" id="astm_ClassOfWarrantOrRightAdditionalNumberOfRightsDistributedPerCommonShare" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired" id="astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer" id="astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod" id="astm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsCancelledInPeriodWeightedAverageExercisePrice" id="astm_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsCancelledInPeriodWeightedAverageExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DiversityOfCreditRiskPolicyTextBlock" id="astm_DiversityOfCreditRiskPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsPolicyTextBlock" id="astm_WarrantsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxReconciliationWarrants" id="astm_IncomeTaxReconciliationWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxReconciliationNetOperatingLossBenefit" id="astm_IncomeTaxReconciliationNetOperatingLossBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxReconciliationNetOperatingLossExpirations" id="astm_IncomeTaxReconciliationNetOperatingLossExpirations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OperatingLossCarryforwardsAndTaxCreditCarryforwardsTable" id="astm_OperatingLossCarryforwardsAndTaxCreditCarryforwardsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetOperatingLossCarryforwardsAndTaxCreditCarryforwardsLineItems" id="astm_NetOperatingLossCarryforwardsAndTaxCreditCarryforwardsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeaseAreaLeased" id="astm_OperatingLeaseAreaLeased" type="num:areaItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeaseTerm" id="astm_OperatingLeaseTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeaseNumberOfFiveYearMarketValueRenewals" id="astm_OperatingLeaseNumberOfFiveYearMarketValueRenewals" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasePeriodOfMarketValueRenewals" id="astm_OperatingLeasePeriodOfMarketValueRenewals" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeaseRatingClassOfModularManufacturingCleanRoomLaboratoriesAndOfficeSpaceLeased" id="astm_OperatingLeaseRatingClassOfModularManufacturingCleanRoomLaboratoriesAndOfficeSpaceLeased" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightNumberOfRightsPerCommonStockShare" id="astm_ClassOfWarrantOrRightNumberOfRightsPerCommonStockShare" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue" id="astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue" type="xbrli:pureItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger" id="astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger" type="xbrli:pureItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumCumulativePercentageChangeOfOwnershipOverWhichChangeInControlIsConsidered" id="astm_MinimumCumulativePercentageChangeOfOwnershipOverWhichChangeInControlIsConsidered" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PeriodOverWhichCumulativeChangeOfOwnershipRequiredForChangeInControl" id="astm_PeriodOverWhichCumulativeChangeOfOwnershipRequiredForChangeInControl" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxExpenseBenefitReductionResultingFromGrossUnrecognizedTaxBenefitsRecognizedDueToValuationAllowance" id="astm_IncomeTaxExpenseBenefitReductionResultingFromGrossUnrecognizedTaxBenefitsRecognizedDueToValuationAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="CollaborativeArrangementRoyaltyRevenueAsPercentageOfNetSalesOfProducts" id="astm_CollaborativeArrangementRoyaltyRevenueAsPercentageOfNetSalesOfProducts" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumPeriodBeforeCashAndCashEquivalentsAreFullyDepleted" id="astm_MaximumPeriodBeforeCashAndCashEquivalentsAreFullyDepleted" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OmnibusIncentivePlan2009Member" id="astm_OmnibusIncentivePlan2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PriorPlansMember" id="astm_PriorPlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromIssuanceOfConvertibleSecuritiesDependingUponWhichWarrantsContainAntidilutionProvisions" id="astm_ProceedsFromIssuanceOfConvertibleSecuritiesDependingUponWhichWarrantsContainAntidilutionProvisions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightNumberOfWarrantsIssued" id="astm_ClassOfWarrantOrRightNumberOfWarrantsIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="SublicenseAgreementMember" id="astm_SublicenseAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsIssuedInAugust2013Member" id="astm_WarrantsIssuedInAugust2013Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfWarrantHolders" id="astm_NumberOfWarrantHolders" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightWarrantsIssuedValue" id="astm_ClassOfWarrantOrRightWarrantsIssuedValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightWarrantsExercisedValue" id="astm_ClassOfWarrantOrRightWarrantsExercisedValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ErrorOfClassificationOfCarryingValueOfSeriesB1PreferredStockMember" id="astm_ErrorOfClassificationOfCarryingValueOfSeriesB1PreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EarningsPerShareBasicAndDilutedLineItems" id="astm_EarningsPerShareBasicAndDilutedLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetProceedsFromIssuanceOrSaleOfEquity" id="astm_NetProceedsFromIssuanceOrSaleOfEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedToUnderwriterForExerciseOfOverAllotmentOption" id="astm_StockIssuedToUnderwriterForExerciseOfOverAllotmentOption" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CorrectionOfErrorMember" id="astm_CorrectionOfErrorMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccumulatedUndeclaredDividends" id="astm_AccumulatedUndeclaredDividends" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="StockIssuedDuringPeriodValuePreferredStockIssues" id="astm_StockIssuedDuringPeriodValuePreferredStockIssues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesPreferredStockIssues" id="astm_StockIssuedDuringPeriodSharesPreferredStockIssues" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightsRedemptionPricePerRight" id="astm_ClassOfWarrantOrRightsRedemptionPricePerRight" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConvertiblePreferredStock5.5Member" id="astm_ConvertiblePreferredStock5.5Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LincolnParkCapitalFundLLCMember" id="astm_LincolnParkCapitalFundLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ValueOfSharesOfCommonStockToBeSold" id="astm_ValueOfSharesOfCommonStockToBeSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ValueOfSharesOfCommonStockToBePurchased" id="astm_ValueOfSharesOfCommonStockToBePurchased" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PeriodOverWhichSharesOfCommonStockToBePurchased" id="astm_PeriodOverWhichSharesOfCommonStockToBePurchased" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfSharesOfCommonStockToBePurchasedInRegularPurchases" id="astm_NumberOfSharesOfCommonStockToBePurchasedInRegularPurchases" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfSharesOfCommonStockToBePurchasedBasedOnClosingSalePriceOfCommonStock" id="astm_NumberOfSharesOfCommonStockToBePurchasedBasedOnClosingSalePriceOfCommonStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock" id="astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined" id="astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FloorPriceForSaleOfSharesOfCommonStock" id="astm_FloorPriceForSaleOfSharesOfCommonStock" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="StockIssuedDuringPeriodValueReverseStockSplitInLieuOfFractionalShares" id="astm_StockIssuedDuringPeriodValueReverseStockSplitInLieuOfFractionalShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesReverseStockSplitInLieuOfFractionalShares" id="astm_StockIssuedDuringPeriodSharesReverseStockSplitInLieuOfFractionalShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CumulativeProceedsFromIssuanceOfCommonStock" id="astm_CumulativeProceedsFromIssuanceOfCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ReverseStockSplitPolicyTextBlock" id="astm_ReverseStockSplitPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReverseStockSplitAbstract" id="astm_ReverseStockSplitAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLossCarryforwardsAmountUnderstated" id="astm_OperatingLossCarryforwardsAmountUnderstated" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OperatingLossCarryforwardsValuationAllowanceAmountUnderstated" id="astm_OperatingLossCarryforwardsValuationAllowanceAmountUnderstated" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ErrorInIncomeTaxDisclosureMember" id="astm_ErrorInIncomeTaxDisclosureMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodValueCommonStockIssuesIPO" id="astm_StockIssuedDuringPeriodValueCommonStockIssuesIPO" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesCommonStockIssuesIPO" id="astm_StockIssuedDuringPeriodSharesCommonStockIssuesIPO" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EasternCapitalLimitedAndAffiliatesMember" id="astm_EasternCapitalLimitedAndAffiliatesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightPercentageOfCommonStockApprovedToBePurchased" id="astm_ClassOfWarrantOrRightPercentageOfCommonStockApprovedToBePurchased" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightNumberOfRightsDeemedToBeDeliveredPerCommonStockShareIssuedOrTransferred" id="astm_ClassOfWarrantOrRightNumberOfRightsDeemedToBeDeliveredPerCommonStockShareIssuedOrTransferred" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLossCarryforwardsAmountOverstated" id="astm_OperatingLossCarryforwardsAmountOverstated" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodValueConversionOfTemporaryEquity" id="astm_StockIssuedDuringPeriodValueConversionOfTemporaryEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesConversionOfTemporaryEquity" id="astm_StockIssuedDuringPeriodSharesConversionOfTemporaryEquity" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetIncomeLossAvailableToCommonStockholdersBasicBeforeDividends" id="astm_NetIncomeLossAvailableToCommonStockholdersBasicBeforeDividends" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SanofiMember" id="astm_SanofiMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPatentsAndPatentApplicationsToBeAcquired" id="astm_NumberOfPatentsAndPatentApplicationsToBeAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="OrganizationAndSummaryOfSignificantAccountingPoliciesLineItems" id="astm_OrganizationAndSummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty" id="astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ThresholdPercentageOfOutstandingEquitySecuritiesForPrepaymentOfPromissoryNoteDue" id="astm_ThresholdPercentageOfOutstandingEquitySecuritiesForPrepaymentOfPromissoryNoteDue" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LiquidityDisclosureAbstract" id="astm_LiquidityDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LiquidationBasisOfAccountingTextBlock" id="astm_LiquidationBasisOfAccountingTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquipmentAndComputersMember" id="astm_EquipmentAndComputersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BuildingImprovementsAndLeaseholdImprovementsMember" id="astm_BuildingImprovementsAndLeaseholdImprovementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestructuringAndRelatedCostExpectedStayOnBonusCost" id="astm_RestructuringAndRelatedCostExpectedStayOnBonusCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CTRMBusinessMember" id="astm_CTRMBusinessMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllCountriesAxis" id="astm_AllCountriesAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllStatesAndProvincesAxis" id="astm_AllStatesAndProvincesAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CambridgeMember" id="astm_CambridgeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AnnArborMember" id="astm_AnnArborMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesMonthlyLeasePaymentsFutureMinimumPaymentsDue" id="astm_OperatingLeasesMonthlyLeasePaymentsFutureMinimumPaymentsDue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesSalesForceLeasedAutoFleetFutureMinimumPaymentsDueAbstract" id="astm_OperatingLeasesSalesForceLeasedAutoFleetFutureMinimumPaymentsDueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesSalesForceLeasedAutoFleetFutureMinimumPaymentsRemainderOfFiscalYear" id="astm_OperatingLeasesSalesForceLeasedAutoFleetFutureMinimumPaymentsRemainderOfFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueInTwoYears" id="astm_OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueInTwoYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueInThreeYears" id="astm_OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueInThreeYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueInFourYears" id="astm_OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueInFourYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueInFiveYears" id="astm_OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueInFiveYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueThereafter" id="astm_OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDueThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDue" id="astm_OperatingLeasesSalesForceLeasedAutoFleetPaymentsFutureMinimumPaymentsDue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ScheduleOfBusinessCombinationConsiderationTransferredTableTextBlock" id="astm_ScheduleOfBusinessCombinationConsiderationTransferredTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPatentsAndPatentApplicationsAcquired" id="astm_NumberOfPatentsAndPatentApplicationsAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" id="astm_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CellTherapyAndRegenerativeMedicineBusinessMember" id="astm_CellTherapyAndRegenerativeMedicineBusinessMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OrganizationConsolidationAndPresentationOfFinancialStatementsTable" id="astm_OrganizationConsolidationAndPresentationOfFinancialStatementsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" id="astm_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesLeasedOfficeSpaceFutureMinimumPaymentsDueAbstract" id="astm_OperatingLeasesLeasedOfficeSpaceFutureMinimumPaymentsDueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesLeasedOfficeSpaceFutureMinimumPaymentsRemainderOfFiscalYear" id="astm_OperatingLeasesLeasedOfficeSpaceFutureMinimumPaymentsRemainderOfFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesLeasedOfficeSpaceFutureMinimumPaymentsDueInTwoYears" id="astm_OperatingLeasesLeasedOfficeSpaceFutureMinimumPaymentsDueInTwoYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ValueOfRemainingSharesOfCommonStockToBeSold" id="astm_ValueOfRemainingSharesOfCommonStockToBeSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ValueOfAdditionalCommonSharesCouldBeSold" id="astm_ValueOfAdditionalCommonSharesCouldBeSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CommonStockRemainingCapacity" id="astm_CommonStockRemainingCapacity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
</xsd:schema>





