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  <xs:element id="sibn_StockIssuedDuringPeriodAmountRestrictedStockUnits" abstract="false" name="StockIssuedDuringPeriodAmountRestrictedStockUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="sibn_SaleOfStockNumberOfSharesAvailableForUnderwriterOption" abstract="false" name="SaleOfStockNumberOfSharesAvailableForUnderwriterOption" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
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  <xs:element id="sibn_DevelopmentAgreementMember" abstract="true" name="DevelopmentAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
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  <xs:element id="sibn_DebtInstrumentLiquidityCovenantProductRevenueThreshold" abstract="false" name="DebtInstrumentLiquidityCovenantProductRevenueThreshold" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="sibn_EricBFromerChiropracticIncClassActionMember" abstract="true" name="EricBFromerChiropracticIncClassActionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="sibn_SolarLoanAndSecurityAgreementMember" abstract="true" name="SolarLoanAndSecurityAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="sibn_OperatingLeasesFutureMinimumPaymentsDueAfterYearFour" abstract="false" name="OperatingLeasesFutureMinimumPaymentsDueAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="sibn_DebtInstrumentCovenantMinimumCashBalance" abstract="false" name="DebtInstrumentCovenantMinimumCashBalance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="sibn_AvailableForSaleDebtSecuritiesCurrentAmortizedCostBasis" abstract="false" name="AvailableForSaleDebtSecuritiesCurrentAmortizedCostBasis" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="sibn_PayrollProtectionProgramLoanCARESActMember" abstract="true" name="PayrollProtectionProgramLoanCARESActMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
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  <xs:element id="sibn_DebtInstrumentPeriodicPaymentInterestOnlyPeriod" abstract="false" name="DebtInstrumentPeriodicPaymentInterestOnlyPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
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  <xs:element id="sibn_ProceedsFromSaleOfMarketableSecurities" abstract="false" name="ProceedsFromSaleOfMarketableSecurities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sibn_ComputerAndOfficeEquipmentMember" abstract="true" name="ComputerAndOfficeEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="sibn_StockIssuedDuringPeriodSharesRestrictedStockUnits" abstract="false" name="StockIssuedDuringPeriodSharesRestrictedStockUnits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
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  <xs:element id="sibn_PharmakonAndSolarTermLoansMember" abstract="true" name="PharmakonAndSolarTermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="sibn_FollowOnPublicOfferingAndSecondaryOfferingMember" abstract="true" name="FollowOnPublicOfferingAndSecondaryOfferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
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</xs:schema>
