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Bar diagrams of poly(Phe) synthesis in hybrid ribosomes. The experiments were performed in the absence (gray bars) or in the presence (black bars) of 10 μM erythromycin. The level of poly(Phe) synthesis has been corrected for the intervention of wild-type ribosomes in the mixed ribosomal populations, and it is expressed in Phe residues incorporated per ribosome in 60 min. Abbreviations under the bars indicate L4 species assembled in each type of ribosome.
