5KX9:
reference: Atomic resolution mechanistic studies of ribocil: A highly selective unnatural ligand mimic of the E. coli FMN riboswitch., Howe JA, Xiao L, Fischmann TO, Wang H, Tang H, Villafania A, Zhang R, Barbieri CM, Roemer T, RNA Biol. 2016 Aug 2:1-9. PMID: 27485612

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