Down's syndrome in twins.
D000015:Abnormalities, Multiple; D001789:Blood Group Antigens; D002648:Child; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D003878:Dermatoglyphics; D004200:Diseases in Twins; D004314:Down Syndrome / Q000235:genetics*; D004592:Electrophoresis, Starch Gel; D004798:Enzymes / Q000097:blood; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D007223:Infant; D009030:Mosaicism; D010641:Phenotype; D011247:Pregnancy; D014314:Trisomy
D001789:Blood Group Antigens; D004798:Enzymes