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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.
Making up about 25% of the total white blood cell count, lymphocytes are a type of white blood cell. Lymphocyte levels are tested as part of a white blood count (WBC).Click here to learn more about white blood cells and a WBC.aking up about 25% of the total white blood cell count, lymphocytes are a type of white blood cell. Lymphocyte levels are tested as part of a white blood count (WBC).