A new variant of blood group B characterized by a weak B antigen on the erythrocytes, anti-B present in the serum, and absence of B substance in saliva has been identified in four related individuals of Finnish descent. The condition appeals to be inherited according to simple Mendelian principles. Weak B variants described by earlier investigators have been categorized into three groups on the basis of the serologic activity of their serum and the presence or absence of B substance in the saliva of secretors of H substance. This is believed to be the first report of a subgroup of B having anti-B in the serum but lacking B substance in saliva.
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