?:definition
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Immunoassay reagents intended to perform qualitative and/or quantitative analysis on a body fluid sample (typically serum) to determine subgroups (subclasses) of immunoglobulin G (IgG), based on structural and antigenic differences in their heavy chains. Five subclasses of IgG are currently determined, denoted by numerical subindexes from IgG1 to IgG5.
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