2KHU:
reference: Unconventional ubiquitin recognition by the ubiquitin-binding motif within the Y family DNA polymerases iota and Rev1., Bomar MG, D'Souza S, Bienko M, Dikic I, Walker GC, Zhou P, Mol Cell. 2010 Feb 12;37(3):408-17. PMID: 20159559

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