?:definition
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Immunoassay reagents intended to perform qualitative and/or quantitative analysis on a body fluid sample (typically serum) to determine subdivisions (i.e., subclasses) of immunoglobulin A (IgA), based on structural and antigenic differences in its heavy chains. Two subclasses of IgA are currently determined, denoted by numerical subindexes as IgA1 and IgA2.
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