1. Laboratory
of Structural Biology, Graduate School of Advanced Science and Engineering, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan
2. Department
of Cellular Biology, Research Institute for Radiation Biology and
Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
3. Institute
for Medical-oriented Structural Biology, Waseda University, 2-2
Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan