Effects of the D286R mutation in UL31 on HSV-1 growth in Vero cells. Vero cells were infected with wild-type HSV-1(F), YK726 (UL31-D286R), or YK727 (UL31-D286R-repair) at an MOI of 3 (A) or 0.01 (B), harvested at the indicated times after infection, and assayed on Vero cells. Each data point is the mean ± standard error from 3 independent experiments. *, P < 0.05 (Tukey’s test) for YK726 (UL31-D286R) versus HSV-1(F) and YK726 (UL31-D286R) versus YK727 (UL31-D286R-repair).