Prenton, M A Umbilical vein-artery and uterine arterio-venous plasma amino acid differences (in the human subject). [electronic resource] - The Journal of obstetrics and gynaecology of the British Commonwealth May 1969 - 404-11 p. digital Publication Type: Journal Article ISSN: 0022-3204 Standard No.: 10.1111/j.1471-0528.1969.tb05855.x doi Subjects--Topical Terms: Amino Acids--bloodAnalysis of VarianceCesarean SectionDelivery, ObstetricFemaleFetus--metabolismGestational AgeHistidine--bloodHumansInfant, NewbornInfant, PrematureLeucine--bloodLysine--bloodMaternal-Fetal ExchangeNitrogen--metabolismPhenylalanine--bloodPlacenta--metabolismPregnancySerine--bloodTyrosine--bloodUmbilical ArteriesUmbilical VeinsUterus--blood supply