Affiliation: | 1. Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan), Fax: (+81)?22‐795‐6877;2. Graduate School of Pharmaceutical Sciences, University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku, Tokyo 113‐0033 (Japan) |