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Comparison of A3R5 and TZM-bl assay using NAb seroconverting samples against tier 2 pseudoviurses. Serial NAb seroconverting plasma samples were tested against 3 tier 2 pseudoviruses in both A3R5 and TZM-bl assays. The dash and full lines indicate the cutoff values for A3R5 and TZM-bl assay respectively.
