1. Clinic of Endocrinology and Diabetes (M.B.-S., J.A.E., M.Y.D.), University Hospital of Zurich, 8091 Zurich, Switzerland
2. Section of Islet Transplantation and Cell Biology (J.T., L.M., G.C.W.), Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts 02215
3. Department of Genetic Medicine and Development (G.P., P.A.H.), University of Geneva, 1211 Geneva 4, Switzerland
4. Thérapie Cellulaire du Diabète (J.K.-C., F.P.), Institut National de la Santé et de la Recherche Médicale Unit M 859, Faculté de Médecine, 59045 Lille Cedex, France