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n. Abbr. IgA
1. The class of antibodies found predominantly in body secretions such as saliva, tears, breast milk, and mucous secretions of the gastrointestinal and respiratory tracts, functioning to prevent attachment of viruses and bacteria to epithelial surfaces and to neutralize toxins.
2. An antibody of this class.
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|Noun||1.||immunoglobulin A - one of the most common of the five major classes of immunoglobulins; the chief antibody in the membranes of the gastrointestinal and respiratory tracts|