Department of Electrical Engineering and Bioscience, Faculty of Science and Engineering, Waseda University, 55N-06-10, 3-4-1, Okubo Shinjuku-ku, Tokyo 169-8555, Japan, Computational Biology Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2-41-6, Aomi, Koto-ku, Tokyo 135-0064, Japan.|Information and Mathematical Science and Bioinformatics Co., Ltd., 4-21-1-601 Higashi-Ikebukuro, Toshima-ku, Tokyo 170-0013, Japan.|Department of Media Analytics, NEC Laboratories America, 10080 North Wolfe Road, Suite SW3-350, Cupertino, CA 95014 and.|Department of Electrical Engineering and Bioscience, Faculty of Science and Engineering, Waseda University, 55N-06-10, 3-4-1, Okubo Shinjuku-ku, Tokyo 169-8555, Japan, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8562, Japan.