title: Parental mosaicism for trisomy 21: problems with its detection and an approach to determining its population rate.
authors.affiliation: St. Petersburg Medical Academy of Postgraduate Studies under the Federal Agency of Health Care and Social Development, St. Petersburg, Russian Federation. kovaleva@robotek.ru
authors.forename: Natalia V
authors.initials: NV
authors.lastname: Kovaleva
mesh_terms: D002891:Chromosomes, Human, Pair 21; D004314:Down Syndrome / Q000175:diagnosis* / Q000235:genetics; D005828:Genetics, Population; D006801:Humans; D009030:Mosaicism; D014314:Trisomy / Q000175:diagnosis* / Q000235:genetics