A antigen gaNAdo. 1 14.1 alp1-R Fuon 1 Introduction A transfer A gene 4 amino a anges Fuca B transferas 小 Figure 1.22 The ABO blood group locus codes for a B antigen Fuoo1 galactosyltransferase whose Deletion specificity determines the A blood group gene Phenotype Genotype Activity 00 No AO or AA N-Ac- gal transferase 消当 BO or BB Gal transferase N-Ac- gal& gal-transferastFigure 1.22 The ABO blood group locus codes for a galactosyltransferase whose specificity determines the blood group. 14.1 Introduction