Center for Information Biology and DDBJ, National Institute of Genetics, Yata, Mishima, Shizuoka, Japan. natanaka@lab.nig.ac.jp|Center for Information Biology and DDBJ, National Institute of Genetics, Yata, Mishima, Shizuoka, Japan. natanaka@lab.nig.ac.jp|Center for Information Biology and DDBJ, National Institute of Genetics, Yata, Mishima, Shizuoka, Japan. natanaka@lab.nig.ac.jp|Center for Information Biology and DDBJ, National Institute of Genetics, Yata, Mishima, Shizuoka, Japan. natanaka@lab.nig.ac.jp