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Neutralization of HIV89.6 mediated by a 1:5 dilution of plasma. The y axis shows the percent neutralization value for each plasma sample at a 1:5 dilution (based on a comparison to the corresponding preimmune plasma). The value above each bar is the reciprocal plasma titer that produced 50% neutralization (i.e., the IC50 value). For each of four animals, the bars show neutralization at weeks 28 and 32, which were 2 and 6 weeks, respectively, after the last immunization.
