3PGD:
reference: Bidirectional binding of invariant chain peptides to an MHC class II molecule., Gunther S, Schlundt A, Sticht J, Roske Y, Heinemann U, Wiesmuller KH, Jung G, Falk K, Rotzschke O, Freund C, Proc Natl Acad Sci U S A. 2010 Nov 29. PMID: 21115828

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