Low alpha-fetoprotein and trisomy.
D000328:Adult; D002902:Chromosomes, Human, 16-18; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014314:Trisomy; D000509:alpha-Fetoproteins / Q000032:analysis*
D000509:alpha-Fetoproteins