3EX4:
reference: Lys314 is a nucleophile in non-classical reactions of orotidine-5'-monophosphate decarboxylase., Heinrich D, Diederichsen U, Rudolph MG, Chemistry. 2009 Jul 6;15(27):6619-25. PMID: 19472232

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