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  <xsd:element id="nxtc_SaleOfAssetCashConsideration" xbrli:periodType="duration" xbrli:balance="debit" name="SaleOfAssetCashConsideration" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="nxtc_LeaseTerminationExpense" xbrli:periodType="duration" xbrli:balance="debit" name="LeaseTerminationExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xsd:element id="nxtc_AmendedAndRestated2019OmnibusIncentivePlanMember" xbrli:periodType="duration" abstract="true" name="AmendedAndRestated2019OmnibusIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" />
  <xsd:element id="nxtc_AreaOfLandLeased" xbrli:periodType="instant" name="AreaOfLandLeased" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" />
  <xsd:element id="nxtc_AreaOfLeaseTerminated" xbrli:periodType="instant" name="AreaOfLeaseTerminated" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" />
  <xsd:element id="nxtc_AssetImpairmentAbstract" xbrli:periodType="duration" abstract="true" name="AssetImpairmentAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xsd:element id="nxtc_CashAndCashEquivalentsAtCarryingValueDebtSecuritiesAvailableForSaleExcludingAccruedInterestCurrent" xbrli:periodType="instant" xbrli:balance="debit" name="CashAndCashEquivalentsAtCarryingValueDebtSecuritiesAvailableForSaleExcludingAccruedInterestCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
</xsd:schema>
