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NCI Dictionary of Cancer Terms


regulatory T cell  listen  (REH-gyoo-luh-TOR-ee T sel)

  A type of immune cell that blocks the actions of some other types of lymphocytes, to keep the immune system from becoming over-active. Regulatory T cells are being studied in the treatment of cancer. A regulatory T cell is a type of white blood cell and a type of lymphocyte. Also called suppressor T cell, T reg, and T-regulatory cell.