1. Computational Biophysics Research Team; RIKEN Advanced Institute for Computational Science; 7-1-26 Minatojima-minamimachi Chuo-ku, Kobe Hyogo Kobe 640-0047 Japan, Fax: +81 48 467 4532
2. RIKEN Theoretical Molecular Science Laboratory; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
3. Laboratory for Biomolecular Function Simulation; RIKEN Quantitative Biology Center (QBiC); IMDA 6F, 1-6-5 Minatojimaminami-machi Chuo-ku, Kobe Hyogo 650-0047 Japan