UL25 content in capsids isolated from KOS- or vUL25-GFP-infected Vero cells. Equivalent amounts of KOS C-capsids or vUL25-GFP C-, B-, or A-capsids were separated by SDS-PAGE, and the gels was immunoblotted with either the UL25 antibody 25E10, the GFP antibody A11122, or the VP5 antibody NC1. Molecular mass standards are visible on the left (kDa).