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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 type of white blood cell in the vertebrate immune system.They have many functions depending on the type such as secretion of antibodies, Immunoregulation and â¦ cytotoxicity, Lysis of virally infected cells such as tumor cells and allografts and they release cytokines and growth factors that regulate other immune cells