URL of this page: //www.nlm.nih.gov/medlineplus/ency/article/002224.htm


An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a foreign substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also be formed inside the body, as with bacterial toxins or tissue cells.

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Update Date 8/17/2014