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<!--Created on: 8/5/2014 1:29:36 AM-->
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  <xsd:element abstract="true" id="cldx_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable" name="FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_AmgenAmendmentMember" name="AmgenAmendmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_CoreTechnologyMember" name="CoreTechnologyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_StockIssuedByTypeOfProgramDomain" name="StockIssuedByTypeOfProgramDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_ControlledEquityOfferingProgramMember" name="ControlledEquityOfferingProgramMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_ControlledEquityOfferingProgramAmendedMember" name="ControlledEquityOfferingProgramAmendedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_ShareholderRightsPlanMember" name="ShareholderRightsPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems" name="FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cldx_ScheduleOfOtherLongTermLiabilitiesTableTextBlock" name="ScheduleOfOtherLongTermLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cldx_DeferredIncomeFromSaleOfTaxBenefits" name="DeferredIncomeFromSaleOfTaxBenefits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cldx_ValueOfTaxBenefitsAgreedToBeSold" name="ValueOfTaxBenefitsAgreedToBeSold" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cldx_PeriodForWhichBaseOfOperationsMustBeMaintained" name="PeriodForWhichBaseOfOperationsMustBeMaintained" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_StockIssuedByTypeOfProgramAxis" name="StockIssuedByTypeOfProgramAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cldx_NoticePeriodForTerminationOfAgreement" name="NoticePeriodForTerminationOfAgreement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cldx_CommonStockExerciseOfFullOverAllotmentOptionToPurchaseAdditionalSharesByUnderwriter" name="CommonStockExerciseOfFullOverAllotmentOptionToPurchaseAdditionalSharesByUnderwriter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_StockholdersEquityTable" name="StockholdersEquityTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_StockholdersEquityLineItems" name="StockholdersEquityLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_USGovernmentAndMunicipalObligationsMember" name="USGovernmentAndMunicipalObligationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cldx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsAmortizedCost" name="AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsAmortizedCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cldx_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedGain" name="AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedGain" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cldx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsGrossUnrealizedGain" name="AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsGrossUnrealizedGain" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cldx_AvailableForSaleSecuritiesGrossUnrealizedLossesAbstract" name="AvailableForSaleSecuritiesGrossUnrealizedLossesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cldx_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedLosses" name="AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cldx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsGrossUnrealizedLosses" name="AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsGrossUnrealizedLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cldx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue" name="AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_FixedRateOfCommissionOnSaleOfStock" name="FixedRateOfCommissionOnSaleOfStock" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_CommonStockIssuanceOfAdditionalSharesAggregateOfferingPrice" name="CommonStockIssuanceOfAdditionalSharesAggregateOfferingPrice" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_ScheduleOfNatureOfBusinessAndOverviewTable" name="ScheduleOfNatureOfBusinessAndOverviewTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_EmployeeConsultantAndNonEmployeeDirectorStockOptionMember" name="EmployeeConsultantAndNonEmployeeDirectorStockOptionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_ShelfRegistrationStatementAmount" name="ShelfRegistrationStatementAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_ClassOfWarrantOrRightNumberOfRightsPerCommonStockShare" name="ClassOfWarrantOrRightNumberOfRightsPerCommonStockShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired" name="ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquiredThroughTender" name="ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquiredThroughTender" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_NumberOfMultiplesClassOfWarrantOrRightConditionOnExerciseOfRightsOfExercisePriceHolderCanReceiveInValueIfFifteenPercentOrMoreOfCommonStockIsAcquired" name="NumberOfMultiplesClassOfWarrantOrRightConditionOnExerciseOfRightsOfExercisePriceHolderCanReceiveInValueIfFifteenPercentOrMoreOfCommonStockIsAcquired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfAssetsOrEarningPowerSoldForHolderRightToReceiveCommonStockOfAcquiringCompany" name="ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfAssetsOrEarningPowerSoldForHolderRightToReceiveCommonStockOfAcquiringCompany" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_CollaborativeArrangementAgreementTerm" name="CollaborativeArrangementAgreementTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_AVANTMember" name="AVANTMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_OperatingLossAndTaxCreditCarryforwardsLineItems" name="OperatingLossAndTaxCreditCarryforwardsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_OperatingLossCarryforwardsAnnualLimitationAmount" name="OperatingLossCarryforwardsAnnualLimitationAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_OperatingLossCarryforwardsExpired" name="OperatingLossCarryforwardsExpired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_OperatingLossCarryforwardsNetOfExpirationsAndUtilization" name="OperatingLossCarryforwardsNetOfExpirationsAndUtilization" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_OperatingLossCarryforwardsWithLimitationsOnUse" name="OperatingLossCarryforwardsWithLimitationsOnUse" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_OperatingLossCarryforwardsRemotelyLikelyToBeUtilized" name="OperatingLossCarryforwardsRemotelyLikelyToBeUtilized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cldx_OwnershipChangeAxis" name="OwnershipChangeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_OwnershipChangeDomain" name="OwnershipChangeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_OwnershipChangeInOctober2007Member" name="OwnershipChangeInOctober2007Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_OwnershipChangesInJune2009AndDecember2009Member" name="OwnershipChangesInJune2009AndDecember2009Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_PeriodOfRecognitionOfUnrealizedGainLossAfterOwnershipChange" name="PeriodOfRecognitionOfUnrealizedGainLossAfterOwnershipChange" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_PriorToAcquisitionMember" name="PriorToAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_PriorToMergerMember" name="PriorToMergerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_StatusOfMergerAndAcquisitionAxis" name="StatusOfMergerAndAcquisitionAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_StatusOfMergerAndAcquisitionDomain" name="StatusOfMergerAndAcquisitionDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_TaxCreditCarryforwardAmountWithSubstantialLimitationsOnUse" name="TaxCreditCarryforwardAmountWithSubstantialLimitationsOnUse" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cldx_OperatingLossAndTaxCreditCarryforwardsTable" name="OperatingLossAndTaxCreditCarryforwardsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cldx_CommonStockSharesAvailableForSale" name="CommonStockSharesAvailableForSale" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_CommonStockAvailableForSaleLockUpPeriodToBeWaivedByUnderwriters" name="CommonStockAvailableForSaleLockUpPeriodToBeWaivedByUnderwriters" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_ValueAtWhichTaxBenefitsSold" name="ValueAtWhichTaxBenefitsSold" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_FairValueAssetsAmountTransfersBetweenMeasurementLevels" name="FairValueAssetsAmountTransfersBetweenMeasurementLevels" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_FairValueLiabilitiesAmountTransfersBetweenMeasurementLevels" name="FairValueLiabilitiesAmountTransfersBetweenMeasurementLevels" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_AvailableForSaleSecuritiesConsideredToBeOtherThanTemporarilyImpaired" name="AvailableForSaleSecuritiesConsideredToBeOtherThanTemporarilyImpaired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cldx_AccumulatedOtherComprehensiveIncomeLossRollForward" name="AccumulatedOtherComprehensiveIncomeLossRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments" name="AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments" name="AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_CollaborativeArrangementEstimatedCostForDevelopmentServices" name="CollaborativeArrangementEstimatedCostForDevelopmentServices" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_CollaborativeArrangementUpfrontPaymentAmount" name="CollaborativeArrangementUpfrontPaymentAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cldx_CelldexResearchEquityIncentivePlan2005AndCuraGenStockPlan2007Member" name="CelldexResearchEquityIncentivePlan2005AndCuraGenStockPlan2007Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="false" id="cldx_DeferredTaxAssetsOperatingLossCarryforwardsNotYetUtilized" name="DeferredTaxAssetsOperatingLossCarryforwardsNotYetUtilized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="false" id="cldx_ExpectedDividendPayableInForeseeableFuture" name="ExpectedDividendPayableInForeseeableFuture" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <element id="cldx_ReimbursementOfExternalCostsIncurredPercentage" name="ReimbursementOfExternalCostsIncurredPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
