3Q3Z:
reference: Structural basis of differential ligand recognition by two classes of bis-(3'-5')-cyclic dimeric guanosine monophosphate-binding riboswitches., Smith KD, Shanahan CA, Moore EL, Simon AC, Strobel SA, Proc Natl Acad Sci U S A. 2011 May 10;108(19):7757-62. Epub 2011 Apr 25. PMID: 21518891

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