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Relative infectivities of MA deletion mutants. GHOST-CXCR4 cells were infected overnight with the parental (WT) or MA deletion mutant versions of HXB/Env−/Nef+, complemented in trans with C-terminally truncated HIV-1 Env. The relative amounts of recombinant virus used are indicated in RT units. Three days after infection, GFP-positive cells were quantitated by flow cytometry. The percentage of cells within the area defined by the horizontal line in each panel is indicated.
