[1] Scripps Res Inst, Dept Immunol & Microbial Sci, La Jolla, CA 92037 USA
[2] Scripps Res Inst, Int AIDS Vaccine Initiat Neutralizing Antibody Ct, La Jolla, CA 92037 USA
[3] Massachusetts Gen Hosp, Ragon Inst, MIT, Boston, MA 02114 USA
[4] Harvard Univ, Boston, MA 02114 USA