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Abbreviation for immunoglobulin A.
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immunoglobulin A
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IgA .ī-.jē-'ā n
1) a class of immunoglobulins that include antibodies found in external bodily secretions (as saliva, tears, and sweat)
2) an immunoglobulin of the class IgA
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immunoglobulin A; see immunoglobulin.Medical dictionary. 2011.