1. Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820-8520, Japan;
2. Neutron Research Center and Center for Promotion of Computational Science and Engineering Japan Atomic Energy Research Institute, 8-1, Umemidai, Kizu-cho, Souraku-gun, Kyoto 619-0215, Japan;
3. PRESTO, Japan Science and Technology Agency, 4-1-8, Honcho, Kawaguchi City, Saitama 332-0012, Japan