Plaque sizes. RK13, RK13-UL34, RK13-UL34-LBRTM, RK13-UL34-EMDTM, RK13-UL34-LapTM, RK13-UL34-LapCT50, RK13-UL34-LapCT100, and RK13-UL34-LapNT cells were infected with PrV-Ka (gray columns) and PrV-ΔUL34 (black columns). Cells were fixed 2 days postinfection, and plaque diameters were measured microscopically. Plaque sizes of PrV-Ka on the corresponding cell line were set as 100%, and diameters of plaques or foci were calculated accordingly. Given are mean values from three independent experiments and corresponding standard deviations.