1ZT1:
reference: The H-2Kk MHC Peptide-Binding Groove Anchors the Backbone of an Octameric Antigenic Peptide in an Unprecedented Mode., Kellenberger C, Roussel A, Malissen B, J Immunol 2005 Sep 15;175(6):3819-3825. PMID: 16148128

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