4OCL:
reference: Crystal structure of the proteasomal deubiquitylation module Rpn8-Rpn11., Pathare GR, Nagy I, Sledz P, Anderson DJ, Zhou HJ, Pardon E, Steyaert J, Forster F, Bracher A, Baumeister W, Proc Natl Acad Sci U S A. 2014 Feb 25;111(8):2984-9. doi:, 10.1073/pnas.1400546111. Epub 2014 Feb 10. PMID: 24516147

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