NFKB1 and infection: Infection of the NFκB reporter cell lines with RBH virus showed that the productively infected cells (tagBFP + mCherry+, ‘purple’) were characterized by higher eGFP MFI (indicative of active NFκB signaling) compared to non-productively infected cells (tagBFP- mCherry+ ‘red’ , or tagBFP- mCherry- ‘double negative’ , Figure 4F – clone 1, Additional file4: Figure S4B – clones 2–4).