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immunoglobulin A

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n.
The class of antibodies produced predominantly against ingested antigens, found in body secretions such as saliva, sweat, and tears, and functioning to prevent attachment of viruses and bacteria to epithelial surfaces.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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