1. Graduate School of Pharmaceutical Sciences, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2. Japan Biological Informatics Consortium, Koto-ku, Tokyo 135-0064, Japan
3. Department of Biotechnology, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo 184-8588, Japan
4. Biological Information Research Center, National Institute of Advanced Industrial Science and Technology, Koto-ku, Tokyo 135-0064, Japan