4ME3:
reference: The 1.8-A Crystal Structure of the N-Terminal Domain of an Archaeal MCM as a Right-Handed Filament., Fu Y, Slaymaker IM, Wang J, Wang G, Chen XS, J Mol Biol. 2013 Dec 27. pii: S0022-2836(13)00812-7. doi:, 10.1016/j.jmb.2013.12.025. PMID: 24378617

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