| 4A1F: reference: Architecture of a dodecameric bacterial replicative helicase., Stelter M, Gutsche I, Kapp U, Bazin A, Bajic G, Goret G, Jamin M, Timmins J, Terradot L, Structure. 2012 Mar 7;20(3):554-64. PMID: 22405014 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).