3DK9:
reference: Catalytic Cycle of Human Glutathione Reductase Near 1 A Resolution., Berkholz DS, Faber HR, Savvides SN, Karplus PA, J Mol Biol. 2008 Jul 7. PMID: 18638483

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