(A) Ribosomal association of [32P]eIF3 after incubation of pre-TCs assembled on MVHL-STOP mRNA with different combination of eRFs and eIFs, as indicated, assayed after sucrose gradient centrifugation by Cerenkov counting and gel electrophoresis (right panel). (B, C) Ribosomal association of [32P]tRNALeu after incubation of pre-TCs assembled in the presence of Leu-[32P]tRNALeu with eRFs and eIFs, as indicated, assayed after sucrose gradient centrifugation by Cerenkov counting. The positions of 40S subunits and 80S ribosomes are indicated.