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Plaque sizes. RK13 (A) or RK13-UL37 (B) cells were infected under plaque assay conditions with PrV-ΔUL37, PrV-ΔUL37/UL35GFP, PrV-UL35GFP, or wild-type PrV-Ka. After 2 days, 50 plaques per virus and cell line were measured microscopically. Mean diameters of three independent experiments are shown as percentages of wild-type PrV-Ka sizes, and standard deviations are also indicated.
