1. Center for Integrative Medicine and Physics, Institute for Advanced Study, Kyoto University, Kyoto 606-8501, Japan
2. Physical Chemistry of Biosystems, Institute of Physical Chemistry, Heidelberg University, 69120 Heidelberg, Germany
3. European Synchrotron Radiation Facility (ESRF), 38043 Grenoble, France
4. NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan