title: Letter: Antenatal diagnosis of neural-tube defects.
mesh_terms: D000328:Adult; D000653:Amniotic Fluid / Q000032:analysis; D005188:False Negative Reactions; D005260:Female; D005865:Gestational Age; D006801:Humans; D008591:Meningomyelocele / Q000175:diagnosis*; D011247:Pregnancy; D011296:Prenatal Diagnosis; D016135:Spinal Dysraphism / Q000175:diagnosis*; D013997:Time Factors; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D000509:alpha-Fetoproteins