3IYX:
reference: Intrinsic molecular properties of the protein-protein bridge facilitate ratchet-like motion of the ribosome., Shasmal M, Chakraborty B, Sengupta J, Biochem Biophys Res Commun. 2010 Aug 20;399(2):192-197. Epub 2010 Jul 17. PMID: 20643101

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