1. Laboratory for Epigenetics Drug Discovery, RIKEN Center for Biosystems Dynamics Research, Yokohama, Kanagawa 230-0045, Japan
2. Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
3. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
4. Graduate School of Science, Chiba University, Chiba, Chiba 263-8522, Japan
5. Department of Computer Science, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8502, Japan