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Updated December 11, 2006

Definition: An antibody is a protein (also called an immunoglobulin) that is made by special white blood cells to bind and neutralize foreign substances. Bacteria, viruses and other invaders stimulate production of antibodies. People with allergies produce a type of antibody called IgE (immunoglobulin E) against pollens, dust mites, molds, foods, and other substances. When the IgE binds to its target, chemicals are released from cells resulting in allergic symptoms.
Pronunciation: an'te-bod-ee

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