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• MCI - MarcoPolo Grants
• MacArthur (John D. and Catherine T.) Foundation
• MacDowell Colony
• MacLean Center for Clinical Medical Ethics
• Macy (Josiah, Jr.) Foundation
• Mailman (A. L.) Family Foundation
• Manville (Johns) Foundation
• Mapplethorpe (Robert) Foundation
• March of Dimes Birth Defects Foundation
• Marine Biological Laboratory
• Markey (Lucille P.) Charitable Trust
• Markle (John and Mary R.) Foundation
• Mathematical Association of America
• Matritech
• Mayday Fund
• McCune (John R.) Charitable Trust
• McCune Foundation
• McDonald (Ronald) House Charities
• McDonnell (James S.) Foundation
• McKnight Endowment Fund for Neuroscience
• McKnight Foundation
• Media Studies Center of Freedom Forum
• Medtronic Foundation
• Melanoma Research Foundation
• Mellon (Andrew W.) Foundation
• Mellon (Richard King) Foundation
• Merck Company Foundation
• Merrill Lynch
• Mertz Gilmore Foundation
• Metropolitan Life Foundation
• Metropolitan Museum of Art
• Michigan Society of Fellows
• Microsoft
• MidAtlantic Arts Foundation
• Milbank Memorial Fund
• Milken Family Foundation
• Millipore Foundation
• Mitsubishi Electric America Foundation
• Mises (Ludwig von) Institute
• Mobil Foundation
• Morris Animal Foundaton
• Morris (Philip) Companies
• Motorola Foundation
• Mott (Charles Stewart) Foundation
• Mount Desert Island Biological Laboratory
• Ms. Foundation
• Murray (Henry A.) Research Center
• Muscular Dystrophy Association (MDA)
• Museum of Comparative Zoology
• Myasthenia Gravis Foundation
• Myoclonus Research Foundation

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