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  <element name="PlacementAgentWarrantsMember" id="capn_PlacementAgentWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock" id="capn_PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrivatePlacementSeriesBWarrantsMember" id="capn_PrivatePlacementSeriesBWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PropertyPlantAndEquipmentCapitalizedInterestCostsAbstract" id="capn_PropertyPlantAndEquipmentCapitalizedInterestCostsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReductionInInitialPublicOfferingCostsPayable" id="capn_ReductionInInitialPublicOfferingCostsPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RedwoodCityCaliforniaMember" id="capn_RedwoodCityCaliforniaMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RegulatoryAssetsAbstract" id="capn_RegulatoryAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodOne" id="capn_RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodOne" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodThree" id="capn_RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodThree" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodTwo" id="capn_RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodTwo" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RoyaltyPaymentPeriod" id="capn_RoyaltyPaymentPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SabbyManagementLlcMember" id="capn_SabbyManagementLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SabbyPurchaseAgreementFirstClosingMember" id="capn_SabbyPurchaseAgreementFirstClosingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SabbyPurchaseAgreementSecondClosingMember" id="capn_SabbyPurchaseAgreementSecondClosingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SaleOfStockConversionOfConvertibleStockConversionPricePerShare" id="capn_SaleOfStockConversionOfConvertibleStockConversionPricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfFullyDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTableTextBlock" id="capn_ScheduleOfFullyDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfSignificantAccountingPoliciesLineItems" id="capn_ScheduleOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfSignificantAccountingPoliciesTable" id="capn_ScheduleOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SecurityPurchaseAgreementNumberofClosings" id="capn_SecurityPurchaseAgreementNumberofClosings" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesAAndSeriesBWarrantsMember" id="capn_SeriesAAndSeriesBWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesAWarrantsMember" id="capn_SeriesAWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesAWarrantsToPurchaseCommonStockMember" id="capn_SeriesAWarrantsToPurchaseCommonStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesBWarrantCashlessExercisesMember" id="capn_SeriesBWarrantCashlessExercisesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesBWarrantsMember" id="capn_SeriesBWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesBWarrantToPurchaseCommonStockMember" id="capn_SeriesBWarrantToPurchaseCommonStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesCWarrantsMember" id="capn_SeriesCWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriescWarrantToPurchaseCommonStockMember" id="capn_SeriescWarrantToPurchaseCommonStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesDWarrantsMember" id="capn_SeriesDWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesDWarrantToPurchaseCommonStockMember" id="capn_SeriesDWarrantToPurchaseCommonStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExpired" id="capn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExpired" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantForfeituresInPeriod" id="capn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantForfeituresInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantGranted" id="capn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantGranted" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsNumberofSharesAvailableRollForward" id="capn_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsNumberofSharesAvailableRollForward" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAndAdditionalDisclosuresAbstract" id="capn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAndAdditionalDisclosuresAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsVestedinPeriodWeightedAverageRemainingContractualTerm" id="capn_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsVestedinPeriodWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesCashlessExerciseOfWarrants" id="capn_StockIssuedDuringPeriodSharesCashlessExerciseOfWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesExercisedOfWarrants" id="capn_StockIssuedDuringPeriodSharesExercisedOfWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesNewIssuesUnderTheAtTheMarketProgram" id="capn_StockIssuedDuringPeriodSharesNewIssuesUnderTheAtTheMarketProgram" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodValueConversionOfWarrantsDerivativeLiability" id="capn_StockIssuedDuringPeriodValueConversionOfWarrantsDerivativeLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodValueNewIssuesUnderTheAtTheMarketProgram" id="capn_StockIssuedDuringPeriodValueNewIssuesUnderTheAtTheMarketProgram" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SubleaseofExcessSpaceMember" id="capn_SubleaseofExcessSpaceMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TemporaryEquitySharesConversionOfConvertibleSecurities" id="capn_TemporaryEquitySharesConversionOfConvertibleSecurities" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TemporaryEquityStatedValuePerShare" id="capn_TemporaryEquityStatedValuePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" id="capn_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TemporaryEquityValueConversionOfConvertibleSecurities" id="capn_TemporaryEquityValueConversionOfConvertibleSecurities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TenderOfferMember" id="capn_TenderOfferMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TenderOfferSeriesBWarrantsMember" id="capn_TenderOfferSeriesBWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TransactionCostsIncludedinAccountsPayable" id="capn_TransactionCostsIncludedinAccountsPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TransactionCostsIncludedinAccruedLiabilities" id="capn_TransactionCostsIncludedinAccruedLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwentySixteenSabbyPurchaseAgreementMember" id="capn_TwentySixteenSabbyPurchaseAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandAndFourteenConvertiblePromissoryNotesMember" id="capn_TwoThousandAndFourteenConvertiblePromissoryNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandAndFourteenPlanMember" id="capn_TwoThousandAndFourteenPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandAndTenAndTwoThousandAndTwelveConvertiblePromissoryNotesMember" id="capn_TwoThousandAndTenAndTwoThousandAndTwelveConvertiblePromissoryNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandAndTenPlanMember" id="capn_TwoThousandAndTenPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnderwriterMember" id="capn_UnderwriterMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnrecognizedTaxBenefitsOffsetByValuationAllowance" id="capn_UnrecognizedTaxBenefitsOffsetByValuationAllowance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantLiabilityDisclosureTextBlock" id="capn_WarrantLiabilityDisclosureTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsExercised" id="capn_WarrantsExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsToPurchaseCommonStockMember" id="capn_WarrantsToPurchaseCommonStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WorkingCapital" id="capn_WorkingCapital" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
</schema>





