1. Computational Biophysics Research Team, RIKEN Advanced Institute for Computational Science, 7-1-26 Minatojima-minamimachi, Chuo-ku, Kobe 650-0047, Japan
2. Theoretical Molecular Science Laboratory, RIKEN, 2-1, Hirosawa, Wako 351-0198, Japan
3. Laboratory for Biomolecular Function Simulation, RIKEN Quantitative Biology Center Computational Biology Research Core, 1-6-5 Minatojima-minamimachi, Kobe 650-0047, Japan