3F8U:
reference: Insights into MHC Class I Peptide Loading from the Structure of the Tapasin-ERp57 Thiol Oxidoreductase Heterodimer., Dong G, Wearsch PA, Peaper DR, Cresswell P, Reinisch KM, Immunity. 2008 Dec 30. PMID: 19119025

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