Trisomy 18 in one of fraternal twins.
D001344:Autopsy; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002902:Chromosomes, Human, 16-18; D004200:Diseases in Twins / Q000235:genetics*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping; D008214:Lymphocytes / Q000166:cytology; D008297:Male; D014314:Trisomy