| 5NEF: reference: The Structure of the Guanidine-II Riboswitch., Huang L, Wang J, Lilley DMJ, Cell Chem Biol. 2017 Jun 22;24(6):695-702.e2. doi:, 10.1016/j.chembiol.2017.05.014. Epub 2017 May 18. PMID: 28529131 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).