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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 are a type of white blood cell, which are an important part of the immune system. Lymphocytes can defend the body against infection because they can distinguish the bodyâs own cells from foreign ones. Once they recognize foreign material in the body, they produce chemicals to destroy that material.wo types of lymphocyte are produced in the bone marrow before birth. B lymphocytes, also called B cells, stay within the bone marrow until they are mature. Once mature, they spread throughout the body and concentrate in the spleen and lymph nodes.