title: Changes in the urinary oestriol conjugate pattern in twin pregnancy.
mesh_terms: D002849:Chromatography, Gas; D004964:Estriol / Q000652:urine*; D005260:Female; D006801:Humans; D008099:Liver / Q000378:metabolism; D011247:Pregnancy; D011272:Pregnancy, Multiple; D013431:Sulfates / Q000652:urine; D014427:Twins
chemical_list: D013431:Sulfates; D004964:Estriol