title: Genetic studies on twins of Down's syndrome with 47-chromosomes.
mesh_terms: D001789:Blood Group Antigens; D002904:Chromosomes, Human, 21-22 and Y; D003878:Dermatoglyphics; D004200:Diseases in Twins; D004314:Down Syndrome / Q000235:genetics*; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008297:Male; D014314:Trisomy
chemical_list: D001789:Blood Group Antigens