Variant of Group B Lacking the B Antigen on the Red Cells

A group B variant, lacking B antigen on the red cells, but secreting small amounts of B substance in the saliva is described. Family investigation showed both parents and three sibs to be normal B. Among six children no normal or abnormal B occurred. It is discussed whether the B variant is due to mutation of the B gene or to the effect of a recessive suppressor gene.