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The thymus is an organ composed of two lobes and is located directly in front of the heart and behind the sternum. It is a critical part of the immune system because it trains and modifies T cells that are used by the body to fight foreign materials that can cause sickness.
The primary function of the thymus is the processing and maturation of T lymphocytes. While in the thymus, T lymphocytes do not respond to pathogens and foreign organisms. After maturation, they enter the blood and go to other lymphatic organs, where they help provide defense. Structurally, the thymus is similar to the spleen and lymph nodes, with numerous lobules and cortical and medullary elements.