title: Alphafetoprotein and chorionic gonadotropin levels in relation to Down's syndrome.
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood*; D004314:Down Syndrome / Q000196:embryology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D006063:Chorionic Gonadotropin; D000509:alpha-Fetoproteins