title: Letter: Alpha fetoprotein in amniotic fluid and maternal serum.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D005326:Fetal Proteins / Q000032:analysis*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D005326:Fetal Proteins; D000509:alpha-Fetoproteins