| 2KJF: reference: The 3D structure of carnocyclin A reveals that many circular bacteriocins share a common structural motif., Martin-Visscher LA, Gong X, Duszyk M, Vederas JC, J Biol Chem. 2009 Aug 18. PMID: 19692336 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).