title: Nicked free beta-subunit and Down syndrome screening.
authors.forename: G E
authors.initials: GE
authors.lastname: Palomaki
authors.forename: J E
authors.initials: JE
authors.lastname: Haddow
mesh_terms: D018997:Chorionic Gonadotropin, beta Subunit, Human / Q000235:genetics*; D004314:Down Syndrome / Q000235:genetics*; D005819:Genetic Markers; D005821:Genetic Techniques; D005820:Genetic Testing / Q000379:methods*; D006801:Humans
chemical_list: D018997:Chorionic Gonadotropin, beta Subunit, Human; D005819:Genetic Markers