1. Division of Biomedical Engineering, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan, Department of Bioengineering, National Cardiovascular Center Research Institute, Fujishirodai, Suita, Osaka, 565-8565, Japan, and Genome Biotechnology Laboratory, Kanazawa Institute of Technology, 3-1, Yasukaho, Hakusan, Ishikawa 924-0838, Japan