1T6L:
reference: The Cytomegalovirus DNA Polymerase Subunit UL44 Forms a C Clamp-Shaped Dimer., Appleton BA, Loregian A, Filman DJ, Coen DM, Hogle JM, Mol Cell 2004 Jul 23;15(2):233-44. PMID: 15260974

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