1. Database Center for Life Science, Research Organization of Information and Systems, 178-4-4 Wakashiba, Kashiwa, Chiba, Japan
2. National Bioscience Database Center, Japan Science and Technology Agency, 5-3 Yonbancho, Chiyoda-ku, Tokyo, Japan
3. DNA Data Bank of Japan Center, National Institute of Genetics, Shizuoka, Japan
4. Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, Japan