4P9D:
reference: The First Crystal Structure of a dTTP Bound Deoxycytidylate Deaminase Validates and Details the Allosteric-Inhibitor Binding Site., Marx A, Alian A, J Biol Chem. 2014 Nov 17. pii: jbc.M114.617720. PMID: 25404739

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