1. State Key Laboratory of Virology, College of Life Sciences, Medical Research Institute, Wuhan University, Wuhan 430072, P.R. China.
2. Institut Pasteur of Shanghai, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, P.R. China.
3. State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai 200438, P.R. China.
4. Section of Infection and Immunity, Herman Ostrow School of Dentistry and Norris Comprehensive Cancer Center, University of Southern California, 925 W 34th Street, Los Angeles, CA 90089, USA.