1. Department of Microbiology and Immunology and Center for AIDS Research, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
2. Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA
3. California National Primate Research Center, University of California at Davis, Davis, California, USA
4. AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory, Frederick, Maryland, USA
5. Albert Einstein College of Medicine, New York, New York, USA
6. Lineberger Cancer Center and Center for AIDS Research, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
7. Gillings School of Public Health and Center for AIDS Research, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA