1. Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
2. Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Yayoi 1-1-1,
Bunkyo-ku, Tokyo 113-8657, Japan
3. School of Pharmaceutical Sciences, Sun Yat-sen University, No. 135, Xingang Xi Road, Guangzhou 510275, P. R. China