the metabolite profiles of the different tissues indicate a number of potential tissue-specific markers : n-acetylaspartate and gamma-aminobutyric acid for rat brain , glutamine/glutamic acid ratio for dog heart , arginine and sucrose for carrot , and t-aconitate , sucrose , asparagine/aspartic acid concentration ratios for corn roots . gamma-aminobutyric acid and malate can be regarded as metabolic indicators for stressed corn roots .
C0017797
glutamine
C0061472
glutamic