Mpared GFP expression of parental and J-Lat shER cells using fluorescence activated cell sorting (FACS). As expected, no GFP-expressing cells could be detected in untreated cells (Figures 6C-6F, mock). About 20 of cells turned GFP-positive in TNF--treated J-Lat 9.2 cells (Figure 6C, TNF-). Importantly, the inhibition of PP5 transcription synergized with TNF- to increase further the number of GFP-