1. Mitsubishi Kagaku Institute of Life Sciences 11 Minami‐ooya Machida Tokyo 194‐8511 Japan
2. Department of Molecular Physiology, Graduate School of Life Sciences, Kumamoto University 1‐1‐1 Honjo Kumamoto 860‐8556 Japan
3. Department of Molecular and Cellular Physiology, Graduate School of Medicine, University of the Ryukyus 207 Uehara Nishihara Okinawa 903‐0215 Japan