1. Centre de Biochimie Structurale, UMR5048 CNRS-Université Montpellier I, UMR554 INSERM-Université Montpellier I, Faculté de Pharmacie, 15 avenue Charles Flahault, BP 14491, 34093 Montpellier-Cedex 5, France, Peptide Institute, Inc., 4-1-2 Ina, Minoh, Osaka 562-8686, Japan, and Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan