4V9N:
reference: Crystal Structure of the 70S Ribosome Bound with the Q253P Mutant Form of Release Factor RF2., Santos N, Zhu J, Donohue JP, Korostelev AA, Noller HF, Structure. 2013 Jun 12. pii: S0969-2126(13)00158-5. doi:, 10.1016/j.str.2013.04.028. PMID: 23769667

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