Department of Computational Biology, Graduate School of Frontier Science, The University of Tokyo Kiban-3A1(CB01) 5-1-5, Kashiwanoha Kashiwa, Chiba 277-8561, Japan. akoike@hgc.jp|Department of Computational Biology, Graduate School of Frontier Science, The University of Tokyo Kiban-3A1(CB01) 5-1-5, Kashiwanoha Kashiwa, Chiba 277-8561, Japan. akoike@hgc.jp|Department of Computational Biology, Graduate School of Frontier Science, The University of Tokyo Kiban-3A1(CB01) 5-1-5, Kashiwanoha Kashiwa, Chiba 277-8561, Japan. akoike@hgc.jp