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  <xs:element id="acog_Rule10b51ArrangementModifiedFlag" name="Rule10b51ArrangementModifiedFlag" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="acog_ScheduleOfSignificantSegmentExpensesTableTextBlock" name="ScheduleOfSignificantSegmentExpensesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="acog_PrepaidFDAUserFees" name="PrepaidFDAUserFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="acog_ScheduleOfCondensedConsolidatedStatementOfCashFlowsAbstract" name="ScheduleOfCondensedConsolidatedStatementOfCashFlowsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xs:schema>
