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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.
One type of white blood cell in the body is known as a lymphocyte. There are many different types of lymphocytes, which like other white blood cells, play a role in fighting infections. When faced with an infection, the number of lymphocytes will multiply in order to have a greater number of cells to combat the invading organism.