title: Amniotic fluid concentrations of alpha-fetoprotein (AFP) in early normal pregnancy, and pregnancy complicated by neural tube defects. A review of 18 months experience.
mesh_terms: D000032:Abortion, Therapeutic; D000649:Amniocentesis; D000653:Amniotic Fluid / Q000032:analysis*; D000757:Anencephaly / Q000175:diagnosis*; D005260:Female; D005326:Fetal Proteins / Q000032:analysis*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D016135:Spinal Dysraphism / Q000175:diagnosis*; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D005326:Fetal Proteins; D000509:alpha-Fetoproteins