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    <element id="PALX_EmergingGrowthCompanyPolicyTextBlock" name="EmergingGrowthCompanyPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_SignificantRisksAndUncertaintiesIncludingBusinessPolicyTextBlock" name="SignificantRisksAndUncertaintiesIncludingBusinessPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_ScheduleOfSegmentInformationBySegmentTextBlock" name="ScheduleOfSegmentInformationBySegmentTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_OperatingLeasesOfLesseDisclosureTextBlock" name="OperatingLeasesOfLesseDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_NanofabricationLabUsageExpense" name="NanofabricationLabUsageExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_UniversityContributionExpense" name="UniversityContributionExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_AccruedUniversityrelatedPayable" name="AccruedUniversityrelatedPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPeriod" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_OperatingCashFlowsFromOperatingLeases" name="OperatingCashFlowsFromOperatingLeases" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_OperatingLeaseLiabilitiesPaymentsLessImputedInterest" name="OperatingLeaseLiabilitiesPaymentsLessImputedInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm3" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm3" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_NetProceedsFromIssuanceOfCommonStock" name="NetProceedsFromIssuanceOfCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PALX_ClassOfWarrantOrRightExercisable" name="ClassOfWarrantOrRightExercisable" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
</schema>
