1. Graduate School of Life Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
2. Biometal Science Laboratory, RIKEN, Harima Institute/SPring-8, Mikazuki, Hyogo 679-5148, Japan
3. Biological Information Research Center (BIRC), National Institute of Advanced Industrial Science and Technology (AIST), Tokyo 135-0064, Japan
4. Department of BioEngineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan