Departments of Biosignal Research and Enzyme Biochemistry, Tokyo Metropolitan Institute of Gerontology, Itabashi-ku, Tokyo 173-0015, Japan; Faculty of Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan; Department of Anatomy, Kyorin University School of Medicine, Mitaka, Tokyo 181-8611, Japan; and Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, Toyama 930-0194, Japan(2005-02-10時点)