title: Letter: Elevated amniotic-fluid alpha-fetoprotein without neural-tube defects.
mesh_terms: D000293:Adolescent; D000328:Adult; D000653:Amniotic Fluid / Q000032:analysis*; D002869:Chromosome Aberrations / Q000175:diagnosis; D025063:Chromosome Disorders; D004386:Duodenum / Q000002:abnormalities; D005260:Female; D005326:Fetal Proteins / Q000032:analysis*; D006801:Humans; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011296:Prenatal Diagnosis; D012868:Skin Abnormalities; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D005326:Fetal Proteins; D000509:alpha-Fetoproteins