FIG. 5.

Penetration kinetics of PrV-1112 and PrV-gKβ. Complementing cells were infected with either PrV-1112 or PrV-gKβ grown on noncomplementing or complementing (PrV-gKβc) cells. After 1 h of incubation on ice, cells were overlaid with prewarmed medium to initiate penetration. At different times thereafter, remaining extracellular virus was inactivated by low-pH treatment. The percentage of PFU surviving low-pH treatment was calculated with reference to a PBS-treated control as percent penetration. Mean values and standard deviations of results of at least three independent experiments are shown.