Immunoprecipitation of 35S-labeled proteins from RK13 cells infected with PrV-Ka, PrV-UL36BSF, or PrV-ΔUL37 with monospecific antisera (anti-UL36, anti-UL37, and anti-gH). The precipitates were separated in a sodium dodecyl sulfate-5% polyacrylamide gel under reducing conditions and analyzed by fluorography. The positions of the authentic and truncated UL36 gene products, of the UL37 protein, and of gH are marked by arrowheads. The molecular masses (in kilodaltons) of marker proteins are indicated on the left.