lymphocyte

a type of white blood cell ( LEUCOCYTE ) produced in the BONE MARROW and also present in the SPLEEN , THYMUS GLAND and LYMPH NODES , which forms a vital component of the IMMUNE system. there are two types: B-cells or B-lymphocyteand and T-cells or T-lymphocyte. B-cells produce ANTIBODIES and search out and bind with particular ANTIGENS . T-cells circulate through the thymus gland, where they differentiate. When they contact an antigen, large numbers of T-cells are generated, which secrete chemical compounds to assist the B-cell in destroying foreign bodies, e.g. BACTERIA .