(A) Left panel - scheme for purification of ABCE1 from RRL, right panel - purified ABCE1 resolved by SDS-PAGE. (B-F) Dissociation of pre-TCs, assembled on MVHL-STOP mRNA with [32P]60S subunits and (B-E) native or (F) transcript Leu-tRNALeu, after incubation with different combinations of eRFs, ABCE1, eIFs and unlabeled 60S subunits at indicated Mg2+ concentrations, assayed by SDG centrifugation. Upper fractions were omitted for clarity.