1. Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan, National Space Development Agency of Japan, 2-1-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan, and Department of Bacterial Infections, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadagaoka, Suita-city, Osaka 565-0871, Japan