2VM3:
reference: Crystallography with Online Optical and X-ray Absorption Spectroscopies Demonstrates an Ordered Mechanism in Copper Nitrite Reductase., Hough MA, Antonyuk SV, Strange RW, Eady RR, Hasnain SS, J Mol Biol. 2008 Apr 25;378(2):353-61. Epub 2008 Feb 12. PMID: 18353369

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