1. Department of Pharmaceutical Molecular Biology, Faculty of Pharmaceutical Sciences, Tohoku University, Aoba, Aoba-ku, Sendai 980, Japan, Department of Pharmacology, School of Pharmaceutical Sciences, Showa University, Hatanodai, Shinagawa-ku, Tokyo 142, Japan, Department of Life Science, Faculty of Science, Himeji Institute of Technology, Harima Science Park City, Hyogo, Japan, Department of Biology, College of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo 153, Japan, and Department of...