1. Department of Diabetes and Clinical Nutrition
2. Section of Islet Transplantation and Cell Biology, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts 02215
3. Division of Stem Cell Regulation Research G6, Medical School, Osaka University, Suita, Osaka 565-0871, Japan
4. Department of Pathology and Biology of Disease
5. Department of Geriatric, Graduate School of Medicine, Kyoto University, Kyoto 606-8507