1. Departments of Physiology,
2. Research Center for Genetic Engineering and Cell Transplantation, Tokai University School of Medicine, Isehara 259-1193;
3. Cardiology,
4. Surgery, and
5. School of Medicine, Keio University, Tokyo 160-8582;
6. Shohnan Kamakura Hospital, Kamakura 247-8533; and
7. High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan