Appendix 09. ABO blood groups and A and B transferase activity

 

A and B transferase activities were measured using sera and tissues from individuals with different ABO blood groups. It was found that A transferase activity was present in biological specimens from individuals with either an A or AB blood group, whereas B transferase activity was observed in specimens from individuals with either the B or AB blood group. Neither A nor B transferase activity was found in specimens from the O blood group individuals.