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Immunity Ability of the body to resist a specific pathogen. Antibodies large proteins that are the basic functional units of a specific immune response. Lymphocyte White blood cell that produces antibodies to assist the immune system. B cell Lymphocyte that matures in bone marrow and produces antibodies. T cell White blood cell that matures in the thymus gland and regulates other cells of the immune system. Vaccine Weakened or mild form of a pathogen that produces immunity to disease when injected into the body. Killer T cell Type of lymphocyte in the immune sytem that attacks and destroys a virus-infected cell. Cell-mediated immunity Action of immune sytem using cells rather than an antigen to attack a pathogen. Helper T cell Type of lymphocyte in the immune system that identifies a specific pathogen in the body. Autoimmune disease Condition that results when the immune system attacks its own cells. Histamine Chemical released by a mast cell to produce an inflammatory response. Monogamy being married (and sexually faithful to one person).