____________ is a protein expressed by bacteria or virus on their cell surface.

Antigen

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Antibody

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Vaccine

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Stem cell

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Solution

The correct option is A Antigen
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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