Western blot analysis of purified virions. Purified virions of PrV-Ka (lanes 2), PrV-UL36(C26S) (lanes 3), and PrV-UL36(C26S)R (lanes 4) as well as noninfected RK13 cells (lanes 1) were separated on a 6% polyacrylamide gel and probed with antisera against pUL36 (A), pUL19 (B), and pUL37 (C). Locations of molecular mass marker proteins (high-molecular-weight markers; Invitrogen) are indicated on the left (A and B) or right (C), respectively.