3AQ1:
reference: Chaperonins from an Antarctic archaeon are predominantly monomeric: crystal structure of an open state monomer., Pilak O, Harrop SJ, Siddiqui KS, Chong K, De Francisci D, Burg D, Williams TJ, Cavicchioli R, Curmi PM, Environ Microbiol. 2011 Apr 7. doi: 10.1111/j.1462-2920.2011.02477.x. PMID: 21477108

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