1PYW:
reference: Exploration of the P6/P7 region of the peptide-binding site of the human class II major histocompatability complex protein HLA-DR1., Zavala-Ruiz Z, Sundberg EJ, Stone JD, DeOliveira DB, Chan IC, Svendsen J, Mariuzza RA, Stern LJ, J Biol Chem 2003 Nov 7;278(45):44904-12. Epub 2003 Sep 1. PMID: 12952957

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