2CF4:
reference: An archaeal peptidase assembles into two different quaternary structures: A tetrahedron and a giant octahedron., Schoehn G, Vellieux FM, Asuncion Dura M, Receveur-Brechot V, Fabry CM, Ruigrok RW, Ebel C, Roussel A, Franzetti B, J Biol Chem. 2006 Nov 24;281(47):36327-37. Epub 2006 Sep 14. PMID: 16973604

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