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Infectivity of EGFP reporter pseudotyped viruses measured by flow cytometric analysis of the target cells. EGFP reporter viruses with NL4-3/WT envelope, NL4-3/SDF1-51, or NL4-3/no Env were added to U87.CD4.CXCR4 cells. After 3 days, the cells were analyzed by FACScan. Numbers represent percentages of GFP-positive cells (upper gated events).
