Abstract

In a previous paper the author reported investigations of a blood sample (Co) whose blood cells contained, in addition to a normal A antigen, a weak, atypical B-like antigen. The present paper deals with two blood samples, El and Do, which probably possessed the same weak, atypical B-like character. A study of El’s family showed that this blood group character, provisionally designated as Ab, may be inheritable, as it was found in two children and one grandchild of El’s.

The serologic studies of the 5 Ab samples are reported, and on the basis of the family material the possible origin of the Ab character is discussed.

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