1. Department of Functional Anatomy and Neuroscience; Nagoya University, Graduate School of Medicine; Nagoya, 65 Tsurumai-cho Showa-ku Aichi 466-8550 Japan
2. Molecular and Cellular Biochemistry; Graduate School of Pharmaceutical Sciences, Tohoku University; 6-3, Aoba, Aramaki, Aoba-ku Sendai Miyagi 980-8578 Japan
3. Department of Cell Pharmacology; Nagoya University, Graduate School of Medicine; Nagoya, 65 Tsurumai-cho Showa-ku Aichi 466-8550 Japan
4. Laboratory of Organic and Medicinal Chemistry; Graduate School of Pharmaceutical Sciences, The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan