1. Barbara Davis Center for Childhood Diabetes (J.M.W., T.J.G., L.M.F., L.Y., G.S.E., H.W.D., J.C.H.), Anschutz Medical Campus, University of Colorado Denver, Aurora, Colorado 80045;
2. Diabetes Research Institute (M.W., A.-G.Z.), Forschergruppe Diabetes e.V., D-80804 Munich, Germany