1Q3S:
reference: Crystal structures of the group II chaperonin from Thermococcus strain KS-1: steric hindrance by the substituted amino acid, and inter-subunit rearrangement between two crystal forms., Shomura Y, Yoshida T, Iizuka R, Maruyama T, Yohda M, Miki K, J Mol Biol 2004 Jan 30;335(5):1265-78. PMID: 14729342

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