1. Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Chemistry and Biotechnology Center, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0403 USA, and Japan Synchrotron Radiation Research Institute (JASRI), 1-1 Kouto, Mikazuki, Sayo, Hyogo 679-5198, Japan