title: Prenatal diagnosis: a problem in verification.
mesh_terms: D001769:Blood; D002901:Chromosomes, Human, 13-15; D005321:Extraembryonic Membranes / Q000648:ultrastructure; D005260:Female; D006801:Humans; D007621:Karyotyping; D008214:Lymphocytes / Q000648:ultrastructure; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014314:Trisomy; D014470:Umbilical Cord