4R7Y:
reference: Analysis of the crystal structure of an active MCM hexamer., Miller JM, Arachea BT, Epling LB, Enemark EJ, Elife. 2014 Sep 29;3. doi: 10.7554/eLife.03433. PMID: 25262915

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