title: [Small supernumerary metacentric chromosome in a sister of a child with trisomy 21].
mesh_terms: D002675:Child, Preschool; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D003878:Dermatoglyphics; D005260:Female; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000235:genetics; D007621:Karyotyping; D008297:Male; D014314:Trisomy
vernacular_title: Petit chromosome métacentrique surnuméraire chez la soeur d'un enfant atteint de trisomie 21.