2CGT:
reference: An expanded protein folding cage in the GroEL-gp31 complex., Clare DK, Bakkes PJ, van Heerikhuizen H, van der Vies SM, Saibil HR, J Mol Biol. 2006 May 5;358(3):905-11. Epub 2006 Mar 6. PMID: 16549073

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