patients with chronic liver disease with superimposed acute insults , i.e. , gastrointestinal bleeding , infection , alcoholic hepatitis , had elevated levels of the aromatic amino acids , phenylalanine , tyrosine , and tryptophan , as well as methionine , glutamate , and aspartate , whereas levels of the branched chain amino acids , valine , leucine , and isoleucine , were consistently depressed .
C0002521
branched
C0042285
valine