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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 seems to be much less important in adults-for example, you can remove it and an adult will live because other parts of the immune system can handle the load. However, the thymus is important, especially to T cell maturation (as we will see in the section on white blood cells below).The spleen filters the blood looking for foreign cells (the spleen is also looking for old red blood cells in need of replacement).t is responsible for producing T-cells (see the next section), and is especially important in newborn babies-without a thymus a baby's immune system collapses and the baby will die.