title: [A case of trisomy 21 (47, XX, 21 +) due to interchromosome effect].
mesh_terms: D002869:Chromosome Aberrations / Q000235:genetics*; D025063:Chromosome Disorders; D002904:Chromosomes, Human, 21-22 and Y; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping; D010375:Pedigree; D014314:Trisomy
vernacular_title: A propos d'une observation de trisomie 21 (47, XX, 21 +) par effet interchromosomique.