1. Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 Japan, Department of Biology, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 Japan, Life Science Laboratory, Shimadzu Corporation, Kyoto 604-8511 Japan, Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka 565-0871 Japan, and Department of Chemistry, Nara Womens University, Nara 630-8506 Japan