Bioinformatics Center, Institute for Chemical Research, Kyoto University, Uji, Gokasho, Japan.|Bioinformatics Center, Institute for Chemical Research, Kyoto University, Uji, Gokasho, Japan. morihiro@kuicr.kyoto-u.ac.jp.|Bioinformatics Center, Institute for Chemical Research, Kyoto University, Uji, Gokasho, Japan.|Bioinformatics Center, Institute for Chemical Research, Kyoto University, Uji, Gokasho, Japan. takutsu@kuicr.kyoto-u.ac.jp.