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Neutralization of the macrophage-tropic (CCR5, R5) primary isolate 93US073 (A), BaL (B) and the CXCR4 (X4) laboratory isolate HxB2 (C) by sera from two CCR5Δ32 individuals, and sera from exposed HIV-1 seronegative CCR5+/+ individuals, as measured by a p24 production assay. The data in A and B is the average of two independent neutralization experiments.
