Table 3 Percentage GFP positive cells and mean GFP fluorescence in sh119-transduced IS-1 and IS-1 PAI-2 cells. Transduced cells were assessed for GFP expression by flow cytometry. GFP positive cells were gated equally for each cell type, 5 and 31 days after transduction with the sh119 vector. Mean F is the mean fluorescence of gated GFP positive cells.