title: [Problems posed by genetic diseases: trisomy 21].
authors.affiliation: Service d'embryologie et de cytogénétique, hôpital Necker-Enfants malades, 75743 Paris 15. n.morichon@nck.aphp.fr
authors.forename: Nicole
authors.initials: N
authors.lastname: Morichon-Delvallez
authors.forename: Catherine
authors.initials: C
authors.lastname: Turleau
mesh_terms: D004314:Down Syndrome / Q000150:complications* / Q000175:diagnosis / Q000235:genetics*; D005190:Family / Q000523:psychology; D005817:Genetic Counseling; D006801:Humans; D009030:Mosaicism; D014178:Translocation, Genetic