Laboratory of DNA Information Analysis, University of Tokyo, Minato-ku, Tokyo, Japan. aloks@ims.u-tokyo.ac.jp|Laboratory of DNA Information Analysis, University of Tokyo, Minato-ku, Tokyo, Japan. aloks@ims.u-tokyo.ac.jp|Laboratory of DNA Information Analysis, University of Tokyo, Minato-ku, Tokyo, Japan. aloks@ims.u-tokyo.ac.jp|Laboratory of DNA Information Analysis, University of Tokyo, Minato-ku, Tokyo, Japan. aloks@ims.u-tokyo.ac.jp|Laboratory of DNA Information Analysis, University of Tokyo, Minato-ku, Tokyo, Japan. aloks@ims.u-tokyo.ac.jp|Laboratory of DNA Information Analysis, University of Tokyo, Minato-ku, Tokyo, Japan. aloks@ims.u-tokyo.ac.jp