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Atomic resolution crystal (3.5 Å) structure of the E. coli 50S ribosomal subunit (PDB identifier 2AW4) showing the nucleotides involved in protein folding. Nucleotides U2473, U2491, C2551, A2560, and A2587, which interact with the unfolded protein, are situated at the entry mouth (shown by an arrow) of the tunnel and are depicted as CPK models. The figure was created using the BIOSYM package (Insight II; Biosym/MSI).
