Amino acids shown included GABA, β-alanine, glutamic and aspartic acids, taurine and 2-aminoadipic acid. Statistical analysis employed a one way ANOVA with post-hoc analysis (significance set a p<0.05). Data presented as mean ± SEM for both x and y-values. Animal numbers included vehicle (n=21), 35 (n=8), 70 (n=6) and 140 mg/kg/d (n=8).