1. Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California 92037;,
2. Neutralizing Antibody Center, International AIDS Vaccine Initiative, The Scripps Research Institute, La Jolla, California 92037
3. Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, The Scripps Research Institute, La Jolla, California 92037
4. Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University; Boston, Massachusetts 02142