| 4ZC0: reference: Structure and primase-mediated activation of a bacterial dodecameric replicative helicase., Bazin A, Cherrier MV, Gutsche I, Timmins J, Terradot L, Nucleic Acids Res. 2015 Sep 30;43(17):8564-76. doi: 10.1093/nar/gkv792. Epub 2015, Aug 11. PMID: 26264665 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).