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(a) Top view and (b) side view of a three-dimensional model showing peptide A bound within the HLA-DQ2 (α1*0501, β1*0201) binding cleft. Inset: HLA-DQ α- and β-chain residues important in forming the negatively charged anchoring P1 pocket. The circle in (b) outlines the anchoring side chain of the glutamine residue corresponding to amino acid 33 in peptide A within the P1 pocket.
