1. Yanagida BioMotron Project, Exploratory Research for Advanced Technology, and Single Molecule Process Project, 2–4–14 Senba–Higashi, Mino, Osaka 562–0035, Japan
2. International Cooperative Research Project, Japan Science and Technology Corporation, 2–4–14 Senba–Higashi, Mino, Osaka 562–0035 , Japan
3. Department of Physiology I, Osaka University Medical School, 2–2 famadaoka, Suita, Osaka 565–0871, Japan