title: Ultrasound screening in a twin pregnancy with high serum alpha-fetoprotein.
mesh_terms: D000649:Amniocentesis; D000653:Amniotic Fluid / Q000032:analysis; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D009436:Neural Tube Defects / Q000175:diagnosis*; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014429:Twins, Dizygotic; D014463:Ultrasonography; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins