1. Contribution from the Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, Department of Biochemistry, Yamagata University School of Medicine, Yamagata 990-9585, Japan, Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-4970, and Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan