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Mention the four barriers of innate immu...

Mention the four barriers of innate immunity with an example for each .

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Physical barrier .
Ex : Mucus coating of epithelium .
Physiological barrier.
Ex : Acid in stomach / saliva in the mouth / tears from eyes .
Cellular barries .
Ex : WBC/Natural killer cells / Macrophages .
Cytokinin barrier .
Ex : Interferons.
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