1. Institute of Advanced Biomedical Engineering and Science; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
2. Department of Molecular Science and Technology; Ajou University; Suwon 443-749 Korea
3. iPS Cell-based Projects on Cell Transplantation and Cell Dynamics, Graduate School of Pharmaceutical Sciences; Osaka University; 1-6 Yamadaoka Suita Osaka 565 0871 Japan