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        <ExclusionAmt>42591</ExclusionAmt>
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        <Desc>INT'L MEETING REFUND</Desc>
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        <ExclusionAmt>10000</ExclusionAmt>
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      <TotalRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>106669</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>3722</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>96863</ExclusionAmt>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>1000</ProgramServicesAmt>
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        <ProgramServicesAmt>3000</ProgramServicesAmt>
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      <FeesForServicesManagementGrp>
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        <ProgramServicesAmt>177161</ProgramServicesAmt>
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      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>8987</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>6127</ProgramServicesAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>1248500</EOYAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
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        <CurrentTaxYearMinus2YearsAmt>655</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>20635</CurrentTaxYearMinus1YearAmt>
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        <CurrentTaxYearMinus2YearsAmt>676416</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearAmt>106669</CurrentTaxYearAmt>
        <TotalAmt>3337763</TotalAmt>
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        <CurrentTaxYearMinus2YearsAmt>677071</CurrentTaxYearMinus2YearsAmt>
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        <TotalAmt>12864</TotalAmt>
      </SubstantialContributorsAmtGrp>
      <SubstAndDsqlfyPrsnsTotGrp>
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        <CurrentTaxYearMinus2YearsAmt>42574</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearMinus2YearsAmt>1243</CurrentTaxYearMinus2YearsAmt>
        <TotalAmt>4433</TotalAmt>
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        <CurrentTaxYearMinus2YearsAmt>2531</CurrentTaxYearMinus2YearsAmt>
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        <TotalAmt>17915</TotalAmt>
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      <Form990ScheduleAPartVIGrp>
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        <ExplanationTxt>JOURNALS - 2016 AMOUNT: $ 4,952. 2017 AMOUNT: $ 315. MISCELLANEOUS REFUNDS - 2018 AMOUNT: $ 2,531. 2019 AMOUNT: $ 117. 2020 AMOUNT: $ 10,000.</ExplanationTxt>
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        <EndYearBalanceAmt>116573</EndYearBalanceAmt>
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        <ContributionsAmt>86</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-6199</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>2258</OtherExpendituresAmt>
        <EndYearBalanceAmt>102319</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
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        <EndYearBalanceAmt>100838</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <NetUnrealizedGainsInvstAmt>28673</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>28673</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>221055</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>8987</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>8987</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>230042</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>487355</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>487355</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>8987</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>8987</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>496342</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION WILL USE THE ENDOWMENT FUNDS TO SUPPORT THE NEW INVESTIGATOR (GILETTE) AWARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>ISSX BELIEVES THAT IT HAS APPROPRIATE SUPPORT FOR ANY TAX POSITIONS TAKEN, AND AS SUCH, DOES NOT HAVE ANY UNCERTAIN TAX POSITIONS THAT ARE MATERIAL TO THE FINANCIAL STATEMENTS OR THAT WOULD HAVE AN EFFECT ON ITS TAX-EXEMPT STATUS. THERE ARE NO UNRECOGNIZED TAX BENEFITS OR LIABILITIES THAT NEED TO BE RECORDED.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>ISSX HAS AN AGREEMENT WITH SMITHBUCKLIN CORPORATION TO MANAGE ITS OPERATIONS. PER THE AGREEMENT, SMITHBUCKLIN, INC. PROVIDES GENERAL MANAGEMENT, FINANCIAL SERVICES, CONVENTION AND OVERHEAD OPERATING SERVICES. SMITHBUCKLIN'S PERFORMANCE UNDER THIS AGREEMENT IS MONITORED BY THE BOARD OF ISSX.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ISSX IS A MEMBERSHIP ORGANIZATION. ANYONE ENGAGED IN RESEARCH IN XENOBIOTICS, OR IN THE ADMINISTRATION AND/OR REGULATIONS OF SUCH RESEARCH, OR ANYONE WHO EXPRESSES A SCIENTIFIC INTEREST IN THE FIELD WILL BE ELIGIBLE FOR MEMBERSHIP. MEMBERSHIP CATEGORIES ARE SET FORTH IN THE BY-LAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S MEMBERS HAVE THE POWER TO ELECT COUNCIL MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR REVIEWS AND SIGNS THE FINAL FORM 990 AND FILES IT WITH THE IRS. THE EXECUTIVE DIRECTOR SENDS THE FORM 990 TO THE ENTIRE BOARD BEFORE IT IS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>IN CONNECTION WITH ANY ACTUAL OR POSSIBLE CONFLICT OF INTEREST, AN INTERESTED PERSON MUST DISCLOSE THE EXISTENCE OF THE FINANCIAL INTEREST AND BE GIVEN THE OPPORTUNITY TO DISCLOSE ALL MATERIAL FACTS TO THE COUNCIL MEMBERS WITH GOVERNING BOARD DELEGATED POWERS CONSIDERING THE PROPOSED TRANSACTION OR ARRANGEMENT. THE REMAINING COUNCIL MEMBERS SHALL DECIDE IF A CONFLICT OF INTEREST EXISTS. AFTER DISCLOSURE OF THE FINANCIAL INTEREST AND ALL MATERIAL FACTS, AND AFTER ANY DISCUSSION WITH THE INTERESTED PERSON, HE/SHE SHALL LEAVE THE COUNCIL MEETING WHILE THE DETERMINATION OF A CONFLICT OF INTEREST IS DISCUSSED AND VOTED UPON.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE GOVERNING DOCUMENTS, POLICIES, AND FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS NOT CHANGED ITS AUDIT OVERSIGHT PROCESS OR SELECTION PROCESS OF AN INDEPENDENT ACCOUNTANT DURING THE TAX YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
