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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.
What structure plays a role in both the immune system and the endocrine system? The structure or organ that plays a role in the immune system as well as the endocrine system is the thymus. The thymus also plays a role in the lymphatic system. Edit