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Antibody-mediated neutralization of HIV-1 BaL and JRCSF. IgG was purified from the week 28 plasma samples of two macaques that received the HxB2/BaL Env immunogen (closed symbols) and of one animal that received the mock Env immunogen (open symbols). The Hx/BaL Env-immunized macaques were the same two animals represented by the second and third bars in Fig. 4A. Note that the starting IgG concentration of 2 mg/ml is roughly equivalent to a 1:5 plasma dilution.
