| 4JF2: reference: Structure of a class II preQ riboswitch reveals ligand recognition by a new fold., Liberman JA, Salim M, Krucinska J, Wedekind JE, Nat Chem Biol. 2013 Apr 14. doi: 10.1038/nchembio.1231. PMID: 23584677 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).