title: Umbilical-cord insertion as source of pure fetal blood for prenatal diagnosis.
mesh_terms: D001800:Blood Specimen Collection / Q000379:methods; D005260:Female; D005312:Fetal Blood / Q000201:enzymology*; D005332:Fetoscopy / Q000379:methods*; D006596:Hexosaminidases / Q000097:blood*; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D013661:Tay-Sachs Disease / Q000175:diagnosis* / Q000201:enzymology; D014470:Umbilical Cord / Q000098:blood supply*
chemical_list: D006596:Hexosaminidases