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IgA

Immunology.
1.
immunoglobulin A: a class of antibodies predominant in respiratory and alimentary tract secretions and in saliva and tears, functioning as the body's first line of defense against invading foreign substances especially by neutralizing viral antigens and by preventing the adherence of bacteria to mucous membrane surfaces.
Origin of IgA
1960-1965
First recorded in 1960-65
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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