A, SDS-PAGE and phosphorimaging: [35S]Met/Cys-labeled T1L virions, ISVPs, and ISVP*s prior to incubation with RRL reaction mixtures (RRL−) were compared with particles recovered after incubation with RRL (RRL+). B, SDS-PAGE and immunoblotting with anti-virion serum antibodies: T1L ISVPs were incubated at 37 °C in the presence of CsCl and at the indicated times, one aliquot was transferred to a tube with trypsin on ice and the other to a tube with RRL at 32 °C. Both incubations were for 45 min.