The ER aminopeptidase ERAP1 enhances or limits antigen presentation by trimming epitopes to 8-9 residues.
York IA, Chang SC, Saric T, Keys JA, Favreau JM, Goldberg AL, Rock KL. The ER aminopeptidase ERAP1 enhances or limits antigen presentation by trimming epitopes to 8-9 residues. Nat Immunol. 2002 Dec; 3(12):1177-84.