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CD4 fluorescence-activated cell sorter analyses of HeLa CD4 pools transfected with vector expressing each F12-HIV protein or with the hygromycin B resistance vector only (p220.2). HeLa and parental HeLa CD4 cells were used as negative and positive controls, respectively. Dotted lines identify higher values of fluorescence intensity detected in each pool labelled with unspecific phycoerythrin-conjugated mouse immunoglobulin Gs.
