I Antigen presenting cells ■ Concepts Endogenous antigens: antigens produced within cells Exogenous antigens: antigens internalized by endocytosis Ag capturing---m---Endocytosis Phagocytosis Pinocytosis Receptor-mediated endocytosis Ag processing and Ag presentation ■APcI. Antigen presenting cells ◼ Concepts Endogenous antigens: antigens produced within cells Exogenous antigens: antigens internalized by endocytosis Ag capturing-------Endocytosis Phagocytosis Pinocytosis Receptor-mediated endocytosis Ag processing and Ag presentation ◼ APC