6CGA:
reference: A bidentate Polycomb Repressive-Deubiquitinase complex is required for efficient activity on nucleosomes., Foglizzo M, Middleton AJ, Burgess AE, Crowther JM, Dobson RCJ, Murphy JM, Day CL, Mace PD, Nat Commun. 2018 Sep 26;9(1):3932. doi: 10.1038/s41467-018-06186-1. PMID: 30258054

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