Nobel Prize in Medicine for Beginners: How Mary Brunkow, Fred Rasmdell, and Shimon Sakguchi found the body's 'peacekeepers'

Your immune system is your body’s army. It fights off viruses, bacteria, and infections every day. Its elite soldiers are called T cells. Some T cells attack invaders directly, while others coordinate the fight like generals. But sometimes, the army makes a terrible mistake — it attacks its own country.