1JRX:
reference: Kinetic and crystallographic analysis of the key active site acid/base arginine in a soluble fumarate reductase., Mowat CG, Moysey R, Miles CS, Leys D, Doherty MK, Taylor P, Walkinshaw MD, Reid GA, Chapman SK, Biochemistry 2001 Oct 16;40(41):12292-8. PMID: 11591148

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