6YLB:
reference: Crystal structure and ligand-induced folding of the SAM/SAH riboswitch., Huang L, Liao TW, Wang J, Ha T, Lilley DMJ, Nucleic Acids Res. 2020 Jul 27;48(13):7545-7556. doi: 10.1093/nar/gkaa493. PMID: 32520325

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