... Cerebralmetabolism of ammonia and amino acids in patients with fulminanthepatic failure. Gastroenterology 2001, 121:1109-1119.18. Møller SE: Quantification of physiological amino acids by gradient ... transport of amino acids. J Nutr 2006,136:218S-226S.30. Yudkoff M, Daikhin Y, Nissim I, Horyn O, Luhovyy B, Lazarow A, Nissim I:Brain amino acid requirements and toxicity: the example of leucine. ... [17]. Accordingly,theplasmaconcentrationsofaminoacidsatbaseline,measured in the present study, were comparable towhole-blood concentrations of amino acids in humansreported previously [17]....