1. Department of System Design Engineering, Keio University, Yokohama, Kanagawa 223-8522, Japan.
2. Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
3. Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520, USA.
4. Department of Physics, Arizona State University, Tempe, AZ 85287-1504, USA.
5. Leeds Institute of Cardiovascular and Metabolic Medicine and Astbury Center for Structural Molecular Biology, University of Leeds, Leeds, UK.