Identification and virion localization of PrV UL46 and UL47 proteins. Purified virions of PrV-Ka, PrV-ΔUL46, PrV-ΔUL47, and PrV-ΔUL46/47 were analyzed by immunoblotting using monospecific antisera against the UL46, UL47, UL48, UL19, and UL37 proteins or a monoclonal antibody against gB.