[Dizygote twins, the one 47 XX 21+ and clinically mongoloid, the other 46 XX-47 XX 21+ and clinically not mongoloid].
D000328:Adult; D004200:Diseases in Twins; D004314:Down Syndrome; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007621:Karyotyping; D008297:Male; D008875:Middle Aged; D009030:Mosaicism
Jumeaux dizygotes, l'un 47 XX 21+ et cliniquement mongolien, l'autre 46 XX-47 XX 21+ et cliniquement non mongolien.