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in the presentation of extracellular antigens in the cross-presentation pathway. ERAP1 "trimming" modulates the peptide repertoire presented by MHC class I molecules and thereby shapes the adaptive immune response. In murine models, ERAAP (the murine homologue of human ERAP1) deficiency results in a strong alteration and increased immunogenicity of the peptide repertoire presented by MHC-I. Murine models with genetic deficiency for ERAAP have been instrumental for understanding the role of peptide trimming

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