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Lymphocyte

(Science: haematology) white Cell of the blood that are derived from stem cells of the lymphoid series.

two main classes are recognised, t and b lymphocytes, the latter responsible (when activated) for production of antibody, the former subdivided into subsets (helper, suppressor, cytotoxic t-cells) and responsible both for cell-mediated immunity and for stimulating B-cells. An agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection.A type of leucocyte of the agranulocyte group that either differentiate into B or t cells.