[Down's syndrome in twins (according to the study of 15 pairs)].
D002648:Child; D002675:Child, Preschool; D002904:Chromosomes, Human, 21-22 and Y; D003878:Dermatoglyphics; D004200:Diseases in Twins; D004314:Down Syndrome / Q000175:diagnosis / Q000235:genetics*; D005260:Female; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008297:Male; D008423:Maternal Age
Bolezn' Dauna i bliznetsov (po dannym issledovaniia 15 par.