T Lymphocyte (T-cell)

The lymphocyte responsible for cell-mediated immunity. When sensitized, they have a receptor which recognizes a specific chemical antigen (chemical sensitizer). On subsequent exposure to that chemical, the sensitized T-cell releases lymphokines, which attract macrophages, neutrophils, and other white blood cells to the reaction site and inflammation ensues. Also known as T-cells (because developed originally in the thymus). Different T-cells have different functions including: presentation of antigents to B cells to initiate antibody production; Cytotoxic and immune response suppressor cells. Specialized lymphocytes include: a. T-helper cells which assist B-cells to produce antibodies b. T-suppresser cells which suppress immunological activity to avoid over-reaction c. T-cells which release cytokines and assist phagocytes d. T-killer cells which recognized and destroy cancerous cells and cells infected with virus.