Major histocompatibility complex: MHC-I (HLA-A/B/C) presents endogenous peptides to CD8+ T cells; MHC-II (HLA-DR/DP/DQ) presents exogenous peptides to CD4+ T cells. Highly polymorphic (>20,000 HLA alleles).
Major histocompatibility complex: MHC-I (HLA-A/B/C) presents endogenous peptides to CD8+ T cells; MHC-II (HLA-DR/DP/DQ) presents exogenous peptides to CD4+ T cells. Highly polymorphic (>20,000 HLA alleles).