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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.
T cells (also called T lymphocytes) are white blood cells made in the thymus (T is for thymus). The immune system (Part 1 of 2): T cells, B cells, and cytokines The genus thymus, belonging to the dead nettle family labiatae, contains some 350 species and scores of cultivars, but considerably fewer are commonly available through garden centres and nurseries.