[1] Howard Hughes Med Inst, Coconut Grove, FL 33133 USA
[2] Arthrit Fdn, Res Program, Atlanta, GA USA
[3] Leukemia & Lymphoma Soc, New York, NY 10016 USA
[4] Juvenile Diabet Res Fdn Int, New York, NY 10005 USA
[5] Burroughs Wellcome Fund, Res Triangle Pk, NC 27709 USA