Computational Biology Research Center, The National Institute of Advanced Industrial Science and Technology, Aomi Frontier Building 2-43 Aomi, 17F, Koto-ku, Tokyo 135-0064, Japan. tomii@cbrc.jp|Computational Biology Research Center, The National Institute of Advanced Industrial Science and Technology, Aomi Frontier Building 2-43 Aomi, 17F, Koto-ku, Tokyo 135-0064, Japan. tomii@cbrc.jp