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        CD4 T-Cell Epitope Mapping

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        The majority of T cells recognize peptide epitopes bound to major histocompatibility complex (MHC)-encoded glycoproteins on the surface of professional antigen-presenting cells (APC), principally dendritic cells, macrophages, and B cells (1 3 ). Most T cells are specific for peptide epitopes in association with either classical MHC class Ia molecules (HLA-A, B, and C in humans and H2-K, D, and L in mice) in the case of CD8+ T cells, or class II molecules (HLA-DR, DP, and DQ in humans and H2-A and E in mice) for CD4+ T cells. However, a significant proportion of T cells recognize peptide antigens bound to nonclassical MHC class Ib molecules such as the human HLA-E (mouse analog Qa1) (4 ) and mouse H2-M3 (5 ). In addition, some T cells recognize not peptides but lipid or glycolipid antigens bound to nonclassical MHC class Ib molecules such as CD1 in both humans and mice (6 ).
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