title: Letter: Screening for neural-tube defects.
mesh_terms: D000328:Adult; D000510:Alpha-Globulins / Q000032:analysis; D000649:Amniocentesis; D000653:Amniotic Fluid / Q000032:analysis; D000757:Anencephaly / Q000175:diagnosis* / Q000453:epidemiology; D005189:False Positive Reactions; D005260:Female; D005326:Fetal Proteins / Q000032:analysis; D005865:Gestational Age; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011296:Prenatal Diagnosis; D016135:Spinal Dysraphism / Q000175:diagnosis* / Q000453:epidemiology
chemical_list: D000510:Alpha-Globulins; D005326:Fetal Proteins