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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 thymus is a specialized organ of the immune system. It consists of primary lymphoid tissue, which provides a site for the generation and maturation of T lymphocytes, which are critical cells of the adaptive immune system. The thymus is of a pinkish-gray color, soft, and lobulated on its surfaces.