what is antigen ?........
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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. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.
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a substance that enters the body and starts a process that can cause disease. The body then usually produces substances (antibodies) to fight the antigens
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