What is an antigen?

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Question

(C) An antigen is a foreign substance,typically a protein or polysaccharide,that enters the body and is recognized by the immune system as 'non-self'.

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$A$ substance that stimulates the production of antibodies.

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(C) An antigen is a foreign substance,typically a protein or polysaccharide,that enters the body and is recognized by the immune system as 'non-self'.Upon recognition,the immune system is triggered to produce specific proteins called antibodies to neutralize or eliminate the antigen.Therefore,an antigen is defined as a substance that stimulates the production of antibodies.

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