On the basis of serological observations in male twins of group A2 with irregular Anti-A1 (α1,) agglutinins in the serum the possibility of an inheritance of these antibodies is indicated. Further additional five individual observations are included.
Simultaneously it was possible to obtain in the above indicated twins a triple group-and factor paternity exclusion.
The following is proposed:
1. To place on a broad basis the examination of the inheritance of irregular Anti-A1 -Agglutinin.
2. To evaluate the previous «exceptions» to the rules of genetics concerning the system of blood groups and blood factors in the light of the currently known serological and anthropological armentarium.