5CGI:
reference: Selective Inhibition of the Immunoproteasome by Structure-Based Targeting of a Non-catalytic Cysteine., Dubiella C, Baur R, Cui H, Huber EM, Groll M, Angew Chem Int Ed Engl. 2015 Nov 13. doi: 10.1002/anie.201506631. PMID: 26563572

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