Hiding in your skin are tiny lookouts called Langerhans cells. They stretch their arms between skin cells and watch for germs.
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Langerhans cells live in the top layer of your skin. They are also in the lining of your mouth.
They are a kind of dendritic cell. That means they have long, branchy arms. The arms poke out between the skin cells around them, like a net.
A medical student named Paul Langerhans first saw these cells in 1868. He thought they were nerve cells! Scientists later found out they are germ guards.
Your skin is like the outside wall of a castle. Langerhans cells are the guards on that wall.
Scroll up to the 3D model and press Reach for germs, then Catch the germs.