title: Recurrence of apparent de novo 21/21 translocation trisomy in a sibship.
mesh_terms: D002675:Child, Preschool; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007621:Karyotyping; D008297:Male; D010290:Parents; D014314:Trisomy