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        <CurrentTaxYearMinus1YearAmt>1044774</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>630775</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus3YearsAmt>989054</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1226837</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1066048</CurrentTaxYearMinus1YearAmt>
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        <CurrentTaxYearAmt>12864</CurrentTaxYearAmt>
        <TotalAmt>27539</TotalAmt>
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      <SubstAndDsqlfyPrsnsTotGrp>
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        <CurrentTaxYearAmt>12864</CurrentTaxYearAmt>
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        <TotalAmt>1148</TotalAmt>
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        <CurrentTaxYearMinus3YearsAmt>270</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>120</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>5201</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>4952</CurrentTaxYearAmt>
        <TotalAmt>20080</TotalAmt>
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      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>1239993</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1049527</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1332080</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1128771</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>713595</CurrentTaxYearAmt>
        <TotalAmt>5463966</TotalAmt>
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      <PublicSupportCY509Pct>0.93190</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.93640</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.05920</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.05700</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART III, LINE 12, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>JOURNALS - 2012 AMOUNT: $ 9,537. 2013 AMOUNT: $ 270. 2014 AMOUNT: $ 120. 2015 AMOUNT: $ 5,201. 2016 AMOUNT: $ 4,952.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>OTHER INCOME</FormAndLineReferenceDesc>
        <ExplanationTxt>2016 OTHER INCOME ARE REFUNDS.</ExplanationTxt>
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    <IRS990ScheduleB documentId="RetDoc1234500001">
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        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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    </IRS990ScheduleB>
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        <InvestmentEarningsOrLossesAmt>4157</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>672</OtherExpendituresAmt>
        <EndYearBalanceAmt>100838</EndYearBalanceAmt>
      </CYEndwmtFundGrp>
      <CYMinus1YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>99895</BeginningYearBalanceAmt>
        <ContributionsAmt>50</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-1841</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>751</OtherExpendituresAmt>
        <EndYearBalanceAmt>97353</EndYearBalanceAmt>
      </CYMinus1YrEndwmtFundGrp>
      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>98820</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>4090</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>3015</OtherExpendituresAmt>
        <EndYearBalanceAmt>99895</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>84085</BeginningYearBalanceAmt>
        <ContributionsAmt>50</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>16211</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>1526</OtherExpendituresAmt>
        <EndYearBalanceAmt>98820</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>82632</BeginningYearBalanceAmt>
        <ContributionsAmt>50</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>5023</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>3620</OtherExpendituresAmt>
        <EndYearBalanceAmt>84085</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <PrmnntEndowmentBalanceEOYPct>0.39670</PrmnntEndowmentBalanceEOYPct>
      <TermEndowmentBalanceEOYPct>0.60330</TermEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>0</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
      <TotalBookValueLandBuildingsAmt>0</TotalBookValueLandBuildingsAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>746206</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>30281</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>30281</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>715925</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>715925</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1169632</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>1169632</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>1169632</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>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>DISTINGUISHED SCIENTIFIC ACHIEVEMENT AWARD</GrantTypeTxt>
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        <CashGrantAmt>5000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>TRAVEL GRANT</GrantTypeTxt>
        <RecipientCnt>2</RecipientCnt>
        <CashGrantAmt>5708</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>POSTER AWARD PROGRAM</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>201</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>TRAVEL GRANT RECIPIENTS APPLY AND ARE SELECTED BY THE MEMBERSHIP COMMITTEE. THE AWARDS ARE MONITORED BY THE STAFF OF ISSX AND IF A RECIPIENT IS FOUND TO NOT HAVE FULLFILLED THE ELIGIBILITY REQUIREMENT, THE AWARD WILL BE CANCELLED.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>ISSX UPDATED ITS BYLAWS. KEY CHANGES INCLUDE LIMITING HONORARY MEMBERSHIP IN ISSX TO MEMBERS ONLY AND STATING THAT THE QUALIFICATIONS FOR HONORARY MEMBERSHIP INCLUDE THAT ONE HAS MADE OUTSTANDING CONTRIBUTIONS TO THE ADVANCEMENT OF XENOBIOTIC RESEARCH OR HAS PROVIDED HIGH-LEVEL SERVICE TO 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 MEMBERSHIP HAS 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 IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>PROFESSIONAL FEES: PROGRAM SERVICE EXPENSES 380,250. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 380,250. DESIGNER: PROGRAM SERVICE EXPENSES 7,228. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 7,228.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>ISSX HAS NOT CHANGED ITS AUDIT OVERSIGHT PROCESS OR INDEPENDENT AUDITOR SELECTION PROCESS DURING THE YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>