How do immune cells detect infections?

 How do immune cells manage to sort through vast numbers of similar-looking proteins within the body to detect foreign invaders and fight infections.
"For immune cells, singling out foreign proteins is like looking for a needle in a haystack -- where the needle may look very much like a straw, and where some straws may also look very much like a needle," notes McGill University physics professor Paul François.

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How do immune cells detect infections?

Source: Science Daily

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