title: Origin of maternal serum AFP.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis; D000757:Anencephaly / Q000175:diagnosis; D005260:Female; D006801:Humans; D008431:Maternal-Fetal Exchange; D009436:Neural Tube Defects / Q000175:diagnosis*; D011247:Pregnancy; D011296:Prenatal Diagnosis; D016136:Spina Bifida Occulta / Q000175:diagnosis; D000509:alpha-Fetoproteins / Q000032:analysis / Q000096:biosynthesis*
chemical_list: D000509:alpha-Fetoproteins