Gm allotypes

Gm al·lo·types

refers to human immunoglobulin gamma heavy chains that express different Gm allotypic determinants (antigens). Each of the 25 different Gm allotypes is the product of genes within the constant regions of the human gamma heavy chain.
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Linkage of IgA deficiency to Gm allotypes: the influence of Gm allotypes on IgA-IgG subclass deficiency.