3PGC: HLA-DR1 with CLIP (106-120) in its flipped orientation
Image from the RCSB PDB (www.rcsb.org) of PDB ID 3PGC (Gunther, S., Schlundt, A., Sticht, J., Roske, Y., Heinemann, U., Wiesmuller, K.H., Jung, G., Falk, K., Rotzschke, O., Freund, C.) (2010) Bidirectional binding of invariant chain peptides to an MHC class II molecule. Proc.Natl.Acad.Sci.USA 107: 22219-22224