3L6F:
reference: Structural Basis for the Presentation of Tumor-Associated MHC Class II-Restricted Phosphopeptides to CD4(+) T Cells., Li Y, Depontieu FR, Sidney J, Salay TM, Engelhard VH, Hunt DF, Sette A, Topalian SL, Mariuzza RA, J Mol Biol. 2010 Apr 24. PMID: 20417641

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