4UE4:
reference: Translational arrest by a prokaryotic signal recognition particle is mediated by RNA interactions., Beckert B, Kedrov A, Sohmen D, Kempf G, Wild K, Sinning I, Stahlberg H, Wilson DN, Beckmann R, Nat Struct Mol Biol. 2015 Sep 7. doi: 10.1038/nsmb.3086. PMID: 26344568

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