endogenous antigens. an example of these are: viral proteins produced during viral replication proteins produced by intracellular bacteria proteins that have escaped into the cytosol from the phagosome of phagocytes tumor antigens produced by cancer cells self peptides from human cell proteins.xamples of ____ - ____ _______: allergens (cause allergic reactions) foreign tissues and cells (from transplants and transfusions) cells that the body fails to recognize as normal self (autoimmune or cancer).