3BOA:
reference: The Catalytic Activity of Protein-disulfide Isomerase Requires a Conformationally Flexible Molecule., Tian G, Kober FX, Lewandrowski U, Sickmann A, Lennarz WJ, Schindelin H, J Biol Chem. 2008 Nov 28;283(48):33630-40. Epub 2008 Sep 24. PMID: 18815132

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