2K4W:
reference: The Solution Structure of the Monomeric Copper, Zinc Superoxide Dismutase from Salmonella enterica: Structural Insights To Understand the Evolution toward the Dimeric Structure., Mori M, Jimenez B, Piccioli M, Battistoni A, Sette M, Biochemistry. 2008 Nov 12. PMID: 19006322

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