title: Alpha fetoprotein and acetylcholinesterase levels in twins discordant for neural tube defects: dependence on type of fetal membranes.
authors: P T
authors: PT
authors: Schnatterly
authors: W A
authors: WA
authors: Hogge
mesh_terms: D000110:Acetylcholinesterase / Q000032:analysis*; D004200:Diseases in Twins; D005321:Extraembryonic Membranes; D006801:Humans; D007231:Infant, Newborn; D009436:Neural Tube Defects / Q000175:diagnosis*; D011296:Prenatal Diagnosis; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins; D000110:Acetylcholinesterase