title: Maternal serum-A.F.P. in twin pregnance discordant for anencephaly.
mesh_terms: D000757:Anencephaly / Q000175:diagnosis*; D005188:False Negative Reactions; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011272:Pregnancy, Multiple; D011296:Prenatal Diagnosis; D014427:Twins; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins