1. Bioinformatics Center, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
2. Nitto Denko Corporation, 455-6, Hongo, Minogo-cho, Onomichi, Hiroshima, 722-0212, Japan
3. Department of Distribution and Information Engineering, National Institute of Technology, Hiroshima College, 4272-1, Higashino, Osakikamijima-cho, Toyota-gun, Hiroshima, 725-0231, Japan