Effects of CsA and CypA on the early steps of wild-type and mutant HIV-1 infection in adherent cell lines. Titration of VSV-G-pseudotyped HIV-1/GFP in HOS, TE671, and HeLa cells, as indicated, in the presence (open symbols) or absence (filled symbols) of 5 μM CsA. The percentage of infected GFP-positive cells is plotted as a function of input virus dose, in nanograms of reverse transcriptase (RT).