6BDF:
reference: 2.8 A resolution reconstruction of the Thermoplasma acidophilum 20S proteasome using cryo-electron microscopy., Campbell MG, Veesler D, Cheng A, Potter CS, Carragher B, Elife. 2015 Mar 11;4. doi: 10.7554/eLife.06380. PMID: 25760083

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