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  <xs:element name="CurrentLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CurrentLiabilitiesAbstract"/>
  <xs:element name="CommonStockWarrantLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="clsn_CommonStockWarrantLiability"/>
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  <xs:element name="GainlossfromchangeinValuationofCommonStockWarrantLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="clsn_GainlossfromchangeinValuationofCommonStockWarrantLiability"/>
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  <xs:element name="OtherComprehensiveLossAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_OtherComprehensiveLossAbstract"/>
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  <xs:element name="StatementsOfCashFlowsUnauditedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_StatementsOfCashFlowsUnauditedAbstract"/>
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  <xs:element name="NonCashItemsIncludedInNetIncomeLossAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_NonCashItemsIncludedInNetIncomeLossAbstract"/>
  <xs:element name="ChangeInFairValueOfCommonStockWarrantLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="clsn_ChangeInFairValueOfCommonStockWarrantLiability"/>
  <xs:element name="TreasuryStockContributedTo401KPlan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="clsn_TreasuryStockContributedTo401KPlan"/>
  <xs:element name="NetChangesInAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_NetChangesInAbstract"/>
  <xs:element name="CashFlowsFromInvestingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CashFlowsFromInvestingActivitiesAbstract"/>
  <xs:element name="CashFlowsFromFinancingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CashFlowsFromFinancingActivitiesAbstract"/>
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  <xs:element name="DescriptionOfNewAccountingPronouncementsNotYetAdoptedTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_DescriptionOfNewAccountingPronouncementsNotYetAdoptedTextBlockAbstract"/>
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  <xs:element name="InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlockAbstract"/>
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  <xs:element name="AccountsPayableAndAccruedLiabilitiesDisclosureTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlockAbstract"/>
  <xs:element name="DebtDisclosureTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_DebtDisclosureTextBlockAbstract"/>
  <xs:element name="StockholdersEquityNoteDisclosureTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_StockholdersEquityNoteDisclosureTextBlockAbstract"/>
  <xs:element name="DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockAbstract"/>
  <xs:element name="WarrantsTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_WarrantsTextBlockAbstract"/>
  <xs:element name="WarrantsTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_WarrantsTextBlock"/>
  <xs:element name="CommitmentsAndContingenciesDisclosureTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CommitmentsAndContingenciesDisclosureTextBlockAbstract"/>
  <xs:element name="LicensingTransactionTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_LicensingTransactionTextBlockAbstract"/>
  <xs:element name="LicensingTransactionTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_LicensingTransactionTextBlock"/>
  <xs:element name="SignificantAccountingPoliciesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_SignificantAccountingPoliciesAbstract"/>
  <xs:element name="ScheduleOfShareBasedCompensationStockOptionsAndRestrictedStockAwardsActivityTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ScheduleOfShareBasedCompensationStockOptionsAndRestrictedStockAwardsActivityTableTextBlock"/>
  <xs:element name="ScheduleOfCommonStockWarrantLiabilityValuationAssumptionsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ScheduleOfCommonStockWarrantLiabilityValuationAssumptionsTableTextBlock"/>
  <xs:element name="ScheduleOfCommonStockWarrantyLiabilityTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ScheduleOfCommonStockWarrantyLiabilityTableTextBlock"/>
  <xs:element name="ShortTermInvestmentByBondMaturitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ShortTermInvestmentByBondMaturitiesAbstract"/>
  <xs:element name="MaturitiesDomain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_MaturitiesDomain"/>
  <xs:element name="CorporateBondMaturitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CorporateBondMaturitiesAbstract"/>
  <xs:element name="AvailableForSaleDebtSecuritiesFairValueDisclosure" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="clsn_AvailableForSaleDebtSecuritiesFairValueDisclosure"/>
  <xs:element name="ShortTermInvestmentContinuousUnrealizedLossPositionAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ShortTermInvestmentContinuousUnrealizedLossPositionAbstract"/>
  <xs:element name="AvailableForSaleAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_AvailableForSaleAbstract"/>
  <xs:element name="InvestmentIncomeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_InvestmentIncomeAbstract"/>
  <xs:element name="AssetsAndLiabilitiesAtFairValueOnARecurringBasisAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_AssetsAndLiabilitiesAtFairValueOnARecurringBasisAbstract"/>
  <xs:element name="AssetsAbstract0" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_AssetsAbstract0"/>
  <xs:element name="ShortTermInvestmentsAvailableForSaleAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ShortTermInvestmentsAvailableForSaleAbstract"/>
  <xs:element name="AsOfDecember312012Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_AsOfDecember312012Abstract"/>
  <xs:element name="ShortTermInvestmentsAvailableForSaleAbstract0" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ShortTermInvestmentsAvailableForSaleAbstract0"/>
  <xs:element name="AsOfMarch312013Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_AsOfMarch312013Abstract"/>
  <xs:element name="CommonStockWarrantLiabilityFairValueDisclosure" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="clsn_CommonStockWarrantLiabilityFairValueDisclosure"/>
  <xs:element name="OtherAccruedLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_OtherAccruedLiabilitiesAbstract"/>
  <xs:element name="OtherAccruedLiabilitiesMiscellaneousCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="clsn_OtherAccruedLiabilitiesMiscellaneousCurrent"/>
  <xs:element name="FuturePrincipalPaymentsDueOnTheCreditAgreementAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_FuturePrincipalPaymentsDueOnTheCreditAgreementAbstract"/>
  <xs:element name="AssumptionsForValuationOfTheWarrantsIssuedInPreferredStockOfferingAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_AssumptionsForValuationOfTheWarrantsIssuedInPreferredStockOfferingAbstract"/>
  <xs:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate"/>
  <xs:element name="FairValueOfOptionAssumptionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_FairValueOfOptionAssumptionsAbstract"/>
  <xs:element name="RangeDomain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_RangeDomain"/>
  <xs:element name="StockOptionAndRestrictedStockAwardsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_StockOptionAndRestrictedStockAwardsAbstract"/>
  <xs:element name="WeightedAverageContractualTermsOfEquityAwardsOutstanding" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="clsn_WeightedAverageContractualTermsOfEquityAwardsOutstanding"/>
  <xs:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityOtherThanOptionsNonvestedOutstandingIntrinsicValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="clsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityOtherThanOptionsNonvestedOutstandingIntrinsicValue"/>
  <xs:element name="WeightedAverageContractualTermsOfEquityAwardsExercisable" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="clsn_WeightedAverageContractualTermsOfEquityAwardsExercisable"/>
  <xs:element name="SummaryOfWarrantActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_SummaryOfWarrantActivityAbstract"/>
  <xs:element name="WarrantsGrantedWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_WarrantsGrantedWeightedAverageExercisePrice"/>
  <xs:element name="WarrantsExercisedForCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_WarrantsExercisedForCommonStock"/>
  <xs:element name="WarrantsExercisedForCommonStockWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_WarrantsExercisedForCommonStockWeightedAverageExercisePrice"/>
  <xs:element name="FairValueOfWarrantsAssumptionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_FairValueOfWarrantsAssumptionsAbstract"/>
  <xs:element name="FairValueAssumptionsExpectedForfeitureRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_FairValueAssumptionsExpectedForfeitureRate"/>
  <xs:element name="CommonStockWarrantLiabilityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CommonStockWarrantLiabilityAbstract"/>
  <xs:element name="FairValueAssetsAndLiabilitiesTransferBetweenLevel1AndLevel2Level3TransferInOrOutDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_FairValueAssetsAndLiabilitiesTransferBetweenLevel1AndLevel2Level3TransferInOrOutDescription"/>
  <xs:element name="CapitalLeaseTransactionDomain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CapitalLeaseTransactionDomain"/>
  <xs:element name="LoanTrancheAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="clsn_LoanTrancheAmount"/>
  <xs:element name="NoteStockConversionRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_NoteStockConversionRate"/>
  <xs:element name="WarrantsIssuedExpirationPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_WarrantsIssuedExpirationPeriod"/>
  <xs:element name="AggregateOfferingPrice" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_AggregateOfferingPrice"/>
  <xs:element name="CommissiononProceedsfromATMSharesPercent" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CommissiononProceedsfromATMSharesPercent"/>
  <xs:element name="ProceedsFromIssuanceOfWarrantsNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="clsn_ProceedsFromIssuanceOfWarrantsNet"/>
  <xs:element name="CommonStockAndWarrantsIssuedShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CommonStockAndWarrantsIssuedShares"/>
  <xs:element name="LeaseTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_LeaseTerm"/>
  <xs:element name="NumberOfMonthsInWhichFreeRentIsProvided" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_NumberOfMonthsInWhichFreeRentIsProvided"/>
  <xs:element name="LetterOfCreditRequiredByLeaseFaceAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="clsn_LetterOfCreditRequiredByLeaseFaceAmount"/>
  <xs:element name="ReductionAmountOnLetterOfCreditRequiredByLease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="clsn_ReductionAmountOnLetterOfCreditRequiredByLease"/>
  <xs:element name="LetteOfCreditAmountRemainingUntilLeaseTermExpires" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="clsn_LetteOfCreditAmountRemainingUntilLeaseTermExpires"/>
  <xs:element name="SupplyCommitmentDomain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_SupplyCommitmentDomain"/>
  <xs:element name="DeferredRevenueAmortizationPeriod" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_DeferredRevenueAmortizationPeriod"/>
  <xs:element name="ReductionInMilestonePayments" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_ReductionInMilestonePayments"/>
  <xs:element name="CapitalLeaseTransactionAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="clsn_CapitalLeaseTransactionAxis"/>
  <xs:element name="MaturitiesAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="clsn_MaturitiesAxis"/>
  <xs:element name="WarrantLiabilityMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_WarrantLiabilityMember"/>
  <xs:element name="CommonStockWarrantsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CommonStockWarrantsMember"/>
  <xs:element name="YakultAgreementMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_YakultAgreementMember"/>
  <xs:element name="November2011CapitalLeaseMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_November2011CapitalLeaseMember"/>
  <xs:element name="SeriesAConvertiblePreferredStockMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_SeriesAConvertiblePreferredStockMember"/>
  <xs:element name="BetweenThreeToTwelveMonthsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_BetweenThreeToTwelveMonthsMember"/>
  <xs:element name="OtherIncomeNetMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_OtherIncomeNetMember"/>
  <xs:element name="HisunMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_HisunMember"/>
  <xs:element name="StockOptionPlansMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_StockOptionPlansMember"/>
  <xs:element name="WithinThreeMonthsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_WithinThreeMonthsMember"/>
  <xs:element name="CreditAgreementMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_CreditAgreementMember"/>
  <xs:element name="TermALoanMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_TermALoanMember"/>
  <xs:element name="October2009CapitalLeaseMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_October2009CapitalLeaseMember"/>
  <xs:element name="BondmaturitiesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_BondmaturitiesMember"/>
  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="clsn_DocumentAndEntityInformationAbstract"/>
</xs:schema>
