| 2HBN: reference: Crystallization and characterization of the thallium form of the Oxytricha nova G-quadruplex., Gill ML, Strobel SA, Loria JP, Nucleic Acids Res. 2006 Aug 31;. PMID: 16945956 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).