2LBC:
reference: Domain analysis reveals that a deubiquitinating enzyme USP13 performs non-activating catalysis for Lys63-linked polyubiquitin., Zhang YH, Zhou CJ, Zhou ZR, Song AX, Hu HY, PLoS One. 2011;6(12):e29362. Epub 2011 Dec 28. PMID: 22216260

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