1. Division of Chemical Pharmacology and Phytochemistry, National Institute of Health Sciences, 1‐18‐1 Kami‐Yohga, Setagaya‐ku, Tokyo 158‐8501
2. Department of Pharmacology, Toho University School of Pharmaceutical Sciences, Funabashi, Chiba 274‐8510
3. Form and Function, PRESTO, Japan Science and Technology Corporation (JST), Kawaguchi, Saitama 332‐0012
4. Division of Biotechnology, Department of Bioscience, Research Institute, National Cardiovascular Centre, Suita, Osaka 565‐8565, Japan
5. Groupe d'Electrophysiologie Moléculaire, Laboratoire de Bioénergétique Fondamentale et Appliquée, Université Joseph Fourier, B.P. 53 X, F‐38041 Grenoble CEDEX 9, France