Gm Allotypes in Mother‐Father‐Cord Trios1

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Abstract
When tested at a standard dilution (1:30), [human] mother-cord Gm phenotypes are identical. A more sensitive assay reveals that the fetus does possess paternal antigen, i.e., it does produce small amounts of autologous Ig[immunoglobulin]G. The paternal antigens, in both the mother and the cord plasma, appear in a mosaic, one that suggests the fetus has the ability to selectively transfer his own IgG subclasses to the mother.