title: [Unusual cis AB phenotype in ABO group system].
abstract: The authors present serologic characteristics of the "cis AB" phenotype in the ABO blood system on the basis of investigation of three families in Poland and data from the literature and genetic concepts explaining the mechanism of development of this phenotype.
mesh_terms: D000017:ABO Blood-Group System; D003434:Crossing Over, Genetic; D000939:Epitopes; D005260:Female; D005838:Genotype; D006801:Humans; D007048:I Blood-Group System; D008297:Male; D009154:Mutation; D010375:Pedigree; D010641:Phenotype; D014166:Transferases / Q000172:deficiency
chemical_list: D000017:ABO Blood-Group System; D000939:Epitopes; D007048:I Blood-Group System; D014166:Transferases
vernacular_title: Niezwykły fenotyp "cis AB" w układzie ABO