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Antigens work as bar-codes to help the immune system differentiate between body cells and pathogens. Normally the body will not attack its own cells, but is programmed to attack those with foreign antigens.

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12y ago
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10y ago

An invading cell will have foreign antigens. A body cell will have self antigens.

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Anonymous

Lvl 1
4y ago

the white blood cells think they look different

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Q: How does a B cell tell the difference between an invader cell and a body cell?
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