4U2S:
reference: High-resolution structures of cholesterol oxidase in the reduced state provide insights into redox stabilization., Golden E, Karton A, Vrielink A, Acta Crystallogr D Biol Crystallogr. 2014 Dec 1;70(Pt 12):3155-66. doi:, 10.1107/S139900471402286X. Epub 2014 Nov 22. PMID: 25478834

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