(b) Ribosomes from wild-type and ubp3Δ cells grown as indicated for 16 h under rich or starvation (Starv) conditions were enriched through a high-salt cushion (pellet) and the levels of endogenous Rpl3p were analysed by immunoblotting. Ponceau staining of the blot revealed the total amount of proteins (bottom panel). Uncropped images of blots are shown in Supplementary Information, Fig. S6. 