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Neutralization sensitivity of 168 viruses in U87-CD4 cell lines expressing CCR5 or CXCR4 coreceptor. 168P (○, •) and 168C (▪) viruses were used to infect U87-CD4 cell lines expressing CXCR4 (•, ▪) or CCR5 (○) as described for Fig. 1. The V3-directed MAbs were incubated with virus for 1 h prior to infection.
