4ZK8:
reference: Structural insights into the function of a thermostable copper-containing nitrite reductase., Fukuda Y, Tse KM, Lintuluoto M, Fukunishi Y, Mizohata E, Matsumura H, Takami H, Nojiri M, Inoue T, J Biochem. 2014 Feb;155(2):123-35. doi: 10.1093/jb/mvt107. Epub 2013 Nov 30. PMID: 24293549

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