1XCK:
reference: Crystal structure of wild-type chaperonin GroEL., Bartolucci C, Lamba D, Grazulis S, Manakova E, Heumann H, J Mol Biol. 2005 Dec 9;354(4):940-51. Epub 2005 Oct 21. PMID: 16288915

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