1E2O:
reference: Crystal structure of the truncated cubic core component of the Escherichia coli 2-oxoglutarate dehydrogenase multienzyme complex., Knapp JE, Mitchell DT, Yazdi MA, Ernst SR, Reed LJ, Hackert ML, J Mol Biol. 1998 Jul 24;280(4):655-68. PMID: 9677295

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