两类抗原加工处理的胞浆过程比较 CYTOSOLIC PATHWAY ±biquitin Endogenous ATPCytoplasmic →Peptides TAPEndoplasmic →Peptide-class I antigens proteasome reticulum MHC complex complex Exopeptidases Amino acids ENDOCYTIC PATHWAY Exogenous Endocytic compartments →Peptides→Peptide-.classⅡ antigens Endocytosis MHC complex or phagocytosis两类抗原加工处理的胞浆过程比较