1. Section on Islet Transplantation and Cell Biology (L.M., J.T., Y.-B.A., A.O., A.S., S.B.-W., G.C.W.), Research Division, Joslin Diabetes Center and the Department of Medicine, Harvard Medical School, Boston, Massachusetts 02215
2. Molecular Pathology Unit (D.C.S.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
3. Beth Israel Deaconess Medical Center (T.L., H.H.O.), Harvard Medical School, Boston, Massachusetts 02215