3E5E:
reference: Crystal structures of the SAM-III/S(MK) riboswitch reveal the SAM-dependent translation inhibition mechanism., Lu C, Smith AM, Fuchs RT, Ding F, Rajashankar K, Henkin TM, Ke A, Nat Struct Mol Biol. 2008 Oct;15(10):1076-83. Epub 2008 Sep 21. PMID: 18806797

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