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Lymphocyte


A type of white blood cell (leucocyte), present in blood, the lymph nodes, spleen, thymus gland, gut wall, and bone marrow.  Lymphocytes provide immunity and occur in two forms: B-lymphocytes, the agents of the humoral immune system, which recognize antigens and produce specific antibodies against them; and T-lymphocytes, the agents of cell-mediated immune system, which secrete immunologically active compounds and assist B cells in their function.  T-lymphocytes can differentiate into helper, killer, or suppressor cells.