Center for Information Biology and DDBJ, National Institute of Genetics 1111 Yata, Mishima, Shizuoka 411-8540, Japan. natanaka@lab.nig.ac.jp|Center for Information Biology and DDBJ, National Institute of Genetics 1111 Yata, Mishima, Shizuoka 411-8540, Japan. natanaka@lab.nig.ac.jp|Center for Information Biology and DDBJ, National Institute of Genetics 1111 Yata, Mishima, Shizuoka 411-8540, Japan. natanaka@lab.nig.ac.jp|Center for Information Biology and DDBJ, National Institute of Genetics 1111 Yata, Mishima, Shizuoka 411-8540, Japan. natanaka@lab.nig.ac.jp