1. Mitsubishi Kagaku Institute of Life Sciences (MITILS), Minamiooya, Machida, Tokyo 194-8511, Japan, Department of Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu 431-3192, Shizuoka, Japan, Department of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8501, Japan, and Research Center for Structural and Functional Proteomics, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan