| 2OJR: reference: Double-Lanthanide-Binding Tags for Macromolecular Crystallographic Structure Determination., Silvaggi NR, Martin LJ, Schwalbe H, Imperiali B, Allen KN, J Am Chem Soc. 2007 Jun 6;129(22):7114-7120. Epub 2007 May 12. PMID: 17497863 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).