1. Irell & Manella Graduate School of Biological Sciences, Beckman Research Institute of the City of Hope, Duarte, California
2. Division of Molecular Diabetes Research, Department of Diabetes and Metabolic Diseases Research, Beckman Research Institute of the City of Hope, Duarte, California
3. Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
4. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Phoenix, Arizona