Which of the following are true about antigens?

CNS

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Gastro Intestinal Tract

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Both

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None

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Solution

The correct options are
A
CNS

B
Gastro Intestinal Tract

D
None

An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. Usually an antigen is a molecule, perhaps on the cell surface of a bacterium or virus.

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