5ZBM:
reference: Structures of glycolate oxidase from Nicotiana benthamiana reveal a conserved pH sensor affecting the binding of FMN., Liu Y, Wu W, Chen Z, Biochem Biophys Res Commun. 2018 Sep 18;503(4):3050-3056. doi:, 10.1016/j.bbrc.2018.08.092. Epub 2018 Aug 22. PMID: 30143257

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