6HE9:
reference: Cryo-EM structures of the archaeal PAN-proteasome reveal an around-the-ring ATPase cycle., Majumder P, Rudack T, Beck F, Danev R, Pfeifer G, Nagy I, Baumeister W, Proc Natl Acad Sci U S A. 2018 Dec 17. pii: 1817752116. doi:, 10.1073/pnas.1817752116. PMID: 30559193

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