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The eight RRR-to-KKK mutants were tested for neutralization against the HIV-1 inhibitory protein mHSA [30]. TZM-bl cells were infected with an amount of virus representing about 100 ffu. The HIV-1 entry inhibitor mHSA was added at various concentrations. Shown are the means and standard deviations based on ten experiments. Black bars, RRR-mutants; red bar, KKK-mutants.
