What are antigens composed of?

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(D) Antigens are substances that can induce an immune response. Chemically,they are most commonly proteins or large polypeptides. However,they can als

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All of the above

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(D) Antigens are substances that can induce an immune response. Chemically,they are most commonly proteins or large polypeptides. However,they can also be composed of polysaccharides,lipids,or nucleic acids,especially when these molecules are conjugated with proteins. Therefore,antigens can consist of all the mentioned types of molecules. Thus,the correct option is $D$.

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