1. Division of Pharmacotherapy and Experimental Therapeutics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
2. School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
3. Division of Infectious Diseases, Center for AIDS Research, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
4. AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research Inc., Frederick, MD, USA.
5. Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR, USA.
6. Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, USA.
7. Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA.
8. W.M. Keck FTMS Laboratory for Human Health Research, Department of Chemistry, North Carolina State University, Raleigh, NC, USA.