6AQR:
reference: Active site alanine mutations convert deubiquitinases into high-affinity ubiquitin-binding proteins., Morrow ME, Morgan MT, Clerici M, Growkova K, Yan M, Komander D, Sixma TK, Simicek M, Wolberger C, EMBO Rep. 2018 Aug 27. pii: embr.201745680. doi: 10.15252/embr.201745680. PMID: 30150323

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