1MHE:
reference: Structural features impose tight peptide binding specificity in the nonclassical MHC molecule HLA-E., O'Callaghan CA, Tormo J, Willcox BE, Braud VM, Jakobsen BK, Stuart DI, McMichael AJ, Bell JI, Jones EY, Mol Cell 1998 Mar;1(4):531-41. PMID: 9660937

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