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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.
Types of Lymphocytes. There are three types of lymphocytes known as T cells, B cells, and natural killer cells. T cells get their name because they are developed in the thymus gland. These cells are distinguished from other lymphocytes by the specialized T-cell receptor molecule that is located on the surface of the cell. This molecule is important in immunity because it recognizes antigens and is able to bind to them.