IFITM3 and infection: Viral titers were reduced by very similar amounts in control cells (380-fold) compared to IFITM3 knock-out cells (300- and 360-fold) for MR766 infection and in control cells (680-fold) and IFITM3 knock-out cells (510- and 500-fold) for PRVABC59, (Figure 7d, purple bars).