2QRI:
reference: Structural engineering of pMHC reagents for T cell vaccines and diagnostics., Mitaksov V, Truscott SM, Lybarger L, Connolly JM, Hansen TH, Fremont DH, Chem Biol. 2007 Aug;14(8):909-22. PMID: 17719490

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