1. Department of Microbial Pathogenesis, Yale University School of Medicine, New Haven, CT 06536, USA.
2. Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
3. Department of Physiology and Biophysics, Weill Cornell Medical College of Cornell University, New York, NY 10021, USA.
4. Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
5. Department of Immunology and Microbial Science, and IAVI Neutralizing Antibody Center, The Scripps Research Institute, La Jolla, CA 92037, USA.
6. Ragon Institute of MGH, MIT, and Harvard, Cambridge, MA 02129, USA.
7. International AIDS Vaccine Initiative (IAVI), New York, NY 10004, USA.
8. Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA.