A small organ located behind the breastbone that is crucial for T cell development and immune system maturation. It is most active during childhood and gradually shrinks with age.
From Greek 'thymos' meaning spirit or soul, named by ancient anatomist Galen who thought it was the seat of emotions. The connection between this organ and immunity wasn't discovered until the 1960s.
The thymus is like a military training camp for T cells - it teaches them to distinguish friend from foe and eliminates any that might attack the body's own tissues. Amazingly, it starts shrinking after puberty and is mostly replaced by fat in adults, yet its childhood training lasts a lifetime!
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