Letter: Trisomies 21 and 18 in two sibs; another case.
D000293:Adolescent; D000328:Adult; D002869:Chromosome Aberrations / Q000235:genetics*; D025063:Chromosome Disorders; D002902:Chromosomes, Human, 16-18; D002904:Chromosomes, Human, 21-22 and Y; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014314:Trisomy