4XYD:
reference: Structure of the membrane-intrinsic nitric oxide reductase from Roseobacter denitrificans., Crow A, Matsuda Y, Arata H, Oubrie A, Biochemistry. 2016 May 17. PMID: 27185533

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