1. From the Division of Medicine (P.J.B.), University of Bristol, Bristol,U.K.; the Institutio Scientifico San Raffaele (E.B.), Milan, Italy; the Diabetes Research Institute (A.-G.Z.), Krankenhaus München-Schwabing, Munich, Germany; the Departments of Pediatrics (D.A.S.) and Pathology (M.A.A.), University of Florida College of Medicine, Gainesville, Florida; and the Barbara Davis Center for Childhood Diabetes (G.S.E.), University of Colorado Health Sciences Center, Denver, Colorado.