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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 the place where specialized white blood cells known as T-lymphocytes are able to mature. Mature T-lymphocytes only leave the thymus when they are able to recognize cells and substances in the body that are not part of the self and attack them as part of the immune response.