5G5G:
reference: The Escherichia coli Periplasmic Aldehyde Oxidoreductase Is an Exceptional Member of the Xanthine Oxidase Family of Molybdoenzymes., Correia MA, Otrelo-Cardoso AR, Schwuchow V, Sigfridsson Clauss KG, Haumann M, Romao MJ, Leimkuhler S, Santos-Silva T, ACS Chem Biol. 2016 Sep 13. PMID: 27622978

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