title: Alpha-fetoprotein levels in amniotic fluid and maternal serum as determined by radioimmunoassay: implications for prenatal diagnosis of fetal neural tube defects.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D002490:Central Nervous System / Q000002:abnormalities* / Q000196:embryology; D005260:Female; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis; D011863:Radioimmunoassay; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins