6BBM:
reference: Mechanisms of opening and closing of the bacterial replicative helicase., Chase J, Catalano A, Noble AJ, Eng ET, Olinares PD, Molloy K, Pakotiprapha D, Samuels M, Chait B, des Georges A, Jeruzalmi D, Elife. 2018 Dec 24;7. pii: 41140. doi: 10.7554/eLife.41140. PMID: 30582519

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