Figure 2: Analysis of surface expression of gp41, gp41-CHR and 6 hybrid proteins after transfection of the corresponding DNA vaccines by flow cytometry (black-untreated Rat-1 cells, white-stable transfected Rat-1 cells, pDisplay-cells transfected with the empty vector). Antigens were detected using mAb 2F5 and stained with FITC-labeled anti-human-IgG.