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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.
The lymph system is made up mainly of cells called lymphocytes, a type of white blood cell. There are 2 main types of lymphocytes: B lymphocytes (B cells): B cells make proteins called antibodies to help protect the body from germs (bacteria and viruses). T lymphocytes (T cells): There are several types of T cells.