title: Amniotic-fluid acetylcholinesterase and neural-tube defects.
mesh_terms: D000110:Acetylcholinesterase / Q000032:analysis*; D000653:Amniotic Fluid / Q000201:enzymology*; D002802:Cholinesterases / Q000032:analysis*; D005260:Female; D006801:Humans; D009436:Neural Tube Defects / Q000175:diagnosis* / Q000201:enzymology; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second
chemical_list: D000110:Acetylcholinesterase; D002802:Cholinesterases