1 Field of Drug Discovery Research, Faculty of Advanced Life Science, Graduate School of Life Science, Hokkaido University N21 W11, Kita-ku Sapporo 001-0021 Japan [email protected].
2 Graduate School of Life Sciences, Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan.
3 Field of X-ray Structural Biology, Faculty of Advanced Life Science, Graduate School of Life Science, Hokkaido University N10 W8, Kita-ku Sapporo 060-0810 Japan.
4 Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University 3-1-1, Tsushima-naka, Kita-ku Okayama 700-8530 Japan.
5 Department of Bioengineering, Graduate School of Engineering, Osaka City University Sumiyoshi-ku Osaka 558-8585 Japan.