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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PRESIDENT AND CEO IS THE TOP MANAGEMENT OFFICIAL WHOSE COMPENSATION IS REVIEWED AND APPROVED BY THE COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS. THE PRESIDENT/CEO'S COMPENSATION IS COMPARED TO APPROPRIATE RANGES OF COMPENSATION FOR THE POSITION IN ORGANIZATIONS OF SIMILAR SIZE AND WITH SIMILAR RESPONSIBILITIES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 18</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS AVAILABLE FOR PUBLIC INSPECTION UPON REQUEST.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S GOVERNING DOCUMENTS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE FOR INSPECTION AT THE ORGANIZATION'S OFFICE AT 600 ONE KENDALL SQUARE, SUITE 6-105, CAMBRIDGE, MA 02139.</ExplanationTxt>
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</Return>
