1. Section of Infection and Immunity, Ostrow School of Dentistry, Norris Comprehensive Cancer Center, University of Southern California, 925 W. 34th Street, Los Angeles, CA 90089-0641, USA.
2. Key Laboratory of Protein Chemistry and Developmental Biology of Education Ministry of China, College of Life Sciences, Hunan Normal University, Changsha, Hunan 410081, P.R. China.
3. Department of Pathology and Immunology, Youjiang Medical University for Nationalities, Baise, Guangxi 533000, P.R. China.
4. Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
5. State Key Laboratory of Virology, Wuhan University, Wuhan, Hubei 430072, P.R. China.