<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.

This entry appears with permission from the Dictionary of Cell and Molecular Biology

(11 Mar 2008)