4EKZ:
reference: Structural Insights into the Redox-Regulated Dynamic Conformations of Human Protein Disulfide Isomerase., Wang C, Li W, Ren J, Fang J, Ke H, Gong W, Feng W, Wang CC, Antioxid Redox Signal. 2012 Jul 9. PMID: 22657537

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