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Zidovudine susceptibility of the HIV-1 strains H112–2; zidovudine sensitive and its isogenic counterpart (G910–6) using cytofluorimetric measurements of infected cells obtained at days 4, 6 and 8 after infection (Upper). Cells were infected at a MOI of 0.1. The IC50 values as determined by plaque reduction in HeLa-CD4 cells and CEM-GFP assays are provided for comparison (Lower).
