3GX7:
reference: Discrimination between Closely Related Cellular Metabolites by the SAM-I Riboswitch., Montange RK, Mondragon E, van Tyne D, Garst AD, Ceres P, Batey RT, J Mol Biol. 2009 Dec 16. PMID: 20006621

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).