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Binding of gp120 (in the presence of sCD4) (A) and V3 loop peptides (B) from X4 tropic (IIIB, HxBc2, and MN) and R5-tropic (BAL and ADA) HIV-1 to the CXCR4 mimetic peptide CX4-M1. See Section “Materials and Methods” (direct ELISA) for experimental detail. Error bars present deviations from the mean.
