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<!-- Creation Date: 2026-09-11T11:53:07.0896+00:00 -->
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  <xs:element id="rgnt_DecemberTwentyTwentyFourLoanMember" name="DecemberTwentyTwentyFourLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_JanuaryTwentyTwentyFourLoanMember" name="JanuaryTwentyTwentyFourLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_BaxtePaysAmount" name="BaxtePaysAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="rgnt_BaxterServicesMember" name="BaxterServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_ConsecutiveTerm" name="ConsecutiveTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="rgnt_ContingentMilestonePayment" name="ContingentMilestonePayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="rgnt_ContingentObligation" name="ContingentObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="rgnt_CSLMember" name="CSLMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_ChangeInFairValueOfConvertibleNotes" name="ChangeInFairValueOfConvertibleNotes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="rgnt_NetProceedsAfterDeductingUnderwritingDiscountsAndCommissions" name="NetProceedsAfterDeductingUnderwritingDiscountsAndCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="rgnt_AmortizationOfShortTermLoans" name="AmortizationOfShortTermLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="rgnt_ConvertiblePreferredSharesMember" name="ConvertiblePreferredSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_IncreaseInOperatingLeaseRightOfUseAssets" name="IncreaseInOperatingLeaseRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="rgnt_IssuanceCostsAccruedAndChargedToAdditionalPaidInCapital" name="IssuanceCostsAccruedAndChargedToAdditionalPaidInCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="rgnt_LeaseLiabilitiesArisingFromObtainingRightofuseassets" name="LeaseLiabilitiesArisingFromObtainingRightofuseassets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="rgnt_AccruedExpensesRecordedAgainstPrepaidExpenses" name="AccruedExpensesRecordedAgainstPrepaidExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="rgnt_GeneralDetailsTable" name="GeneralDetailsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_FormerLendersMember" name="FormerLendersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_UnauditedInterimCondensedFinancialStatementsPolicyTextBlock" name="UnauditedInterimCondensedFinancialStatementsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="rgnt_WarrantsWithAnExercisePriceOfDollarFourPointThreeSevenFiveMember" name="WarrantsWithAnExercisePriceOfDollarFourPointThreeSevenFiveMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_WarrantsWithAnExercisePriceOf100Member" name="WarrantsWithAnExercisePriceOf100Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_DemandedTotalAmount" name="DemandedTotalAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="rgnt_FuturePayments" name="FuturePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="rgnt_GlobalSalesMember" name="GlobalSalesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="rgnt_PercentageOfGrantReceived" name="PercentageOfGrantReceived" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="rgnt_PercentageOfPayableOnSalesDevelopedProducts" name="PercentageOfPayableOnSalesDevelopedProducts" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="rgnt_PercentageOfSubjectToAServiceCharge" name="PercentageOfSubjectToAServiceCharge" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="rgnt_PurchasePricePerUnit" name="PurchasePricePerUnit" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="rgnt_ReminingBalanceAmount" name="ReminingBalanceAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="rgnt_SupplyAgreementOfTisseelDescription" name="SupplyAgreementOfTisseelDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xs:element id="rgnt_RevaluationOfConvertibleNotes" name="RevaluationOfConvertibleNotes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
</xs:schema>
