1. Howard Hughes Medical Institute (L.C.C., S.J.B., C.J.V., K.W., P.T.), Department of Pathology and Laboratory Medicine, University of California, Los Angeles, California 90095-1662
2. The Center for Diabetes, Endocrinology and Metabolism (L.C.C.), Childrens Hospital Los Angeles, University of Southern California, Los Angeles, California 90027