3MPG:
reference: Structure of dihydroorotase from Bacillus anthracis at 2.6 A resolution., Mehboob S, Mulhearn DC, Truong K, Johnson ME, Santarsiero BD, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010 Nov 1;66(Pt, 11):1432-5. Epub 2010 Oct 27. PMID: 21045288

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