1. Department of Biology; Tokyo Gakugei University; 4-1-1 Nukui kita-machi Koganei-shi Tokyo 184-8501 Japan
2. Division of Membrane Physiology; National Institute for Physiological Sciences; National Institutes of Natural Sciences; Okazaki 444-8787 Japan
3. Department of Physiological Sciences; SOKENDAI (The Graduate University for Advanced Studies); Okazaki 444-8787 Japan
4. Laboratory of Biomembrane; Tokyo Metropolitan Institute of Medical Science; 2-1-6 Kamikitazawa Setagaya Tokyo 156-8506 Japan