5A6D:
reference: Cloning, recombinant production and crystallographic structure of Proliferating Cell Nuclear Antigen from radioresistant archaeon Thermococcus gammatolerans., Venancio-Landeros AA, Rudino-Pinera E, Cardona-Felix CS, Biochem Biophys Rep. 2016 Aug 11;8:200-206. doi: 10.1016/j.bbrep.2016.08.004., eCollection 2016 Dec. PMID: 28955957

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