title: Down's syndrome in twins with discordant HL-A phenotypes.
mesh_terms: D000293:Adolescent; D001789:Blood Group Antigens; D003878:Dermatoglyphics; D004200:Diseases in Twins; D004314:Down Syndrome / Q000209:etiology / Q000235:genetics*; D005260:Female; D005306:Fertilization; D006649:Histocompatibility Antigens; D006650:Histocompatibility Testing; D006801:Humans; D008297:Male; D008423:Maternal Age; D010063:Ovum; D010641:Phenotype
chemical_list: D001789:Blood Group Antigens; D006649:Histocompatibility Antigens