FIG. 9.
Replication kinetics of ORF63 and ORF64/69 deletion mutants. Virus-infected melanoma cells were seeded onto fresh monolayers of melanoma cells. At days 1 through 6 postinfection, the infected monolayer was harvested, and the infected cells were serially diluted and used to infect monolayers of Vero cells in duplicate. At 7 to 8 days postinfection, the Vero cell monolayers were stained with crystal violet, and the number of plaques were counted.