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White blood cells known as lymphocytes arise from by mitosis of stem cells in the bone marrow. Some lymphocytes migrate to the thymus and become T cells that circulate in the blood and are associated with the lymph nodes and spleen.
A lymphocyte is a white blood cell that is part of the immune system. The normal count is 15-40% of the white blood cells. A high concentration usually represents a viral infection and can be an indication of some forms of leukemia.