Link to Antigen-presenting allogeneic dendritic cells. “Antigen Presenting Cell” is a cell from the immune system that functions to teach a person’s immune system to recognize and fight a foreign organism (or cancer). APCs do this by “presenting” antigens to the other immune cells. Antigens are specific molecules associated with a cancer or other organism causing disease. Once an APC has presented an antigen to the other immune cells the immune system remembers the antigen and if the immune cells come in contact with the same antigen, they are stimulated to start an immune reaction and fight the organism or cancer.