1. State Key Laboratory for Microbial Metabolism and School of Life Sciences and Biotechnology; Shanghai Jiaotong University; Shanghai 200030 China
2. Laboratory of Bacterial Pathogenesis; Department of Medical Microbiology and Parasitology; Institutes of Medical Sciences; Shanghai Jiaotong University School of Medicine; Shanghai 200025 China
3. Department of Biological Sciences; California State University; Los Angeles CA 90032 USA
4. Quartermaster Equipment Institute of the General Logistics Department; People's Liberation Army; Beijing 100010 China
5. Department of Infection, Immunity and Inflammation; University of Leicester; Leicester LE1 9HN UK