1. Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215.
2. Harvard Medical School, Boston, MA 02215.
3. Shionogi Aburahi Laboratories, Shiga, Japan.
4. National Institute of Genetics, Shizuoka, Japan.
5. Kyoto University School of Medicine, Kyoto, Japan.
6. Joslin Diabetes Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02215.