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    <element id="ACTU_UICLicenseAgreementMember" name="UICLicenseAgreementMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_StockIncentivePlan2024Member" name="StockIncentivePlan2024Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_StockOptionsMember" name="StockOptionsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_WarrantsMember" name="WarrantsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_RestrictedStockUnitAwardsMember" name="RestrictedStockUnitAwardsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_June2025PrivatePlacementWarrantsMember" name="June2025PrivatePlacementWarrantsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_UnderwriterWarrantsIssuedUnderIPOMember" name="UnderwriterWarrantsIssuedUnderIPOMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_WarrantsOriginallyIssuedInConjunctionWithSeriesBRedeemableConvertiblePreferredStockMember" name="WarrantsOriginallyIssuedInConjunctionWithSeriesBRedeemableConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_WarrantsOriginallyIssuedInConjunctionWithSeriesCRedeemableConvertiblePreferredStockMember" name="WarrantsOriginallyIssuedInConjunctionWithSeriesCRedeemableConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_June2025PrivatePlacementWarrantMember" name="June2025PrivatePlacementWarrantMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_SecuritiesPurchaseAgreementMember" name="SecuritiesPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_UnvestedRestrictedStockAwardsMember" name="UnvestedRestrictedStockAwardsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_UnvestedServiceBasedRSAMember" name="UnvestedServiceBasedRSAMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_UnvestedPerformanceBasedRSAMember" name="UnvestedPerformanceBasedRSAMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_RestrictedStockAwardsMember" name="RestrictedStockAwardsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_ResearchAndDevelopmentMember" name="ResearchAndDevelopmentMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_GeneralAndAdministrativeMember" name="GeneralAndAdministrativeMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_UnvestedRSUsMember" name="UnvestedRSUsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_UnvestedRSAsMember" name="UnvestedRSAsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_PersonnelAndConsultingExpensesMember" name="PersonnelAndConsultingExpensesMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_ExternalClinicalStudyExpensesMember" name="ExternalClinicalStudyExpensesMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_NonclinicalAndBiomarkerResearchMember" name="NonclinicalAndBiomarkerResearchMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_CmcRelatedCostsMember" name="CmcRelatedCostsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_LicensePayableNoncurrent" name="LicensePayableNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_StockIssuedDuringPeriodValueNewIssues1" name="StockIssuedDuringPeriodValueNewIssues1" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_StockIssuedDuringPeriodSharesNewIssues1" name="StockIssuedDuringPeriodSharesNewIssues1" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_IssuanceOfRestrictedSharesInExchangeForServicesShares" name="IssuanceOfRestrictedSharesInExchangeForServicesShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_ProceedsFromIssuanceOfCommonStock1" name="ProceedsFromIssuanceOfCommonStock1" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_DeferredOfferingCostsChargedAgainstAtthemarketFacility" name="DeferredOfferingCostsChargedAgainstAtthemarketFacility" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_DeferredOfferingCostsUnpaidAndAccrued" name="DeferredOfferingCostsUnpaidAndAccrued" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_DeferredOfferingCostsChargedAgainstCommittedEquityFacility" name="DeferredOfferingCostsChargedAgainstCommittedEquityFacility" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_DisclosureLicensesAndAgreementsAbstract" name="DisclosureLicensesAndAgreementsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_LicensesAndAgreementDisclosureTextBlock" name="LicensesAndAgreementDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_DisclosureWarrantsAbstract" name="DisclosureWarrantsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_WarrantsDisclosureTextBlock" name="WarrantsDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_DisclosureTable" name="DisclosureTable" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" />
    <element id="ACTU_DisclosureLineElements" name="DisclosureLineElements" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_WorkingCapital" name="WorkingCapital" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndSettledInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndSettledInPeriod" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndSettledInPeriodWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndSettledInPeriodWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="ACTU_November2025PublicOfferingMember" name="November2025PublicOfferingMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
</schema>
