1. Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
2. Division of Infectious Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
3. Department of Chemistry, Washington University, St. Louis, Missouri, USA
4. Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, USA
5. The Andrew M. and Jane M. Bursky Center for Human Immunology and Immunotherapy Programs, Washington University School of Medicine, St. Louis, Missouri, USA