Is the gene Ia a duplication?
D000017:ABO Blood-Group System; D000941:Antigens; D004912:Erythrocytes / Q000276:immunology; D006801:Humans; D037102:Lectins; D008967:Molecular Biology; D011995:Recombination, Genetic; D012463:Saliva / Q000276:immunology
D000017:ABO Blood-Group System; D000941:Antigens; D037102:Lectins