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Created page with "Another fascinating player in cellular immunity is the antigen-presenting cell (APC), a diverse number of cells. APCs detect and engulf foreign pathogens, breaking consumers on to smaller fragments known as antigens. These antigens are then provided on the cell surface, acting as warning signals for T cells to identify and answer to. Major histocompatibility complex (MHC) molecules on the APCs' surface allow T cells to recognize antigens because non-self, initiating an a..."