An Antigen is a substance that causes the immune system to make a specific immune response. An antigen may be a foreign substance from the environment such as chemicals, bacteria, viruses, or pollen. An antigen may also be formed within the body, as with bacterial toxins or tissue cells.

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PPRG6-500 Cover
The Pituitary Patient Resource Guide Sixth Edition is now available! Be one of the first to have the most up-to-date information. The Pituitary Patient Resource Guide a one of a kind publication intended as an invaluable source of information not only for patients but also their families, physicians, and all health care providers. It contains information on symptoms, proper testing, how to get a diagnosis, and the treatment options that are available. It also includes Pituitary Network Association's patient resource listings for expert medical care.

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