4L6P:
reference: Distinct structural alterations in proliferating cell nuclear antigen block DNA mismatch repair., Dieckman LM, Boehm EM, Hingorani MM, Washington MT, Biochemistry. 2013 Aug 20;52(33):5611-9. doi: 10.1021/bi400378e. Epub 2013 Aug 2. PMID: 23869605

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