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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.
Lymphocytes. Lymphocytes are a type of white blood cell generated by the immune system to defend the body against cancerous cells, pathogens, and foreign matter. Lymphocytes circulate in blood and lymph fluid and are found in body tissues including the spleen, thymus, bone marrow, lymph nodes, tonsils, and liver.hey are B lymphocytes (B cells) and T lymphocytes (T cells). B cells. B cells develop from bone marrow stem cells in adults. When B cells become activated due to the presence of a particular antigen, they create antibodies that are specific to that specific antigen.