5VZM:
reference: Structural Basis for the Interaction of Mutasome Assembly Factor REV1 with Ubiquitin., Cui G, Botuyan MV, Mer G, J Mol Biol. 2018 Jul 6;430(14):2042-2050. doi: 10.1016/j.jmb.2018.05.017. Epub, 2018 May 18. PMID: 29778604

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