2CMD:
reference: Crystal structure of Escherichia coli malate dehydrogenase. A complex of the apoenzyme and citrate at 1.87 A resolution., Hall MD, Levitt DG, Banaszak LJ, J Mol Biol 1992 Aug 5;226(3):867-82. PMID: 1507230

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