title: Spina bifida: early antenatal diagnosis using amniotic fluid alpha-fetoprotein heterogeneity.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D002846:Chromatography, Affinity; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D016136:Spina Bifida Occulta / Q000175:diagnosis*; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins