Fig 5. Brain monoaminergic neurotransmitter concentrations.

Brain concentrations of A) dopamine, B) norepinephrine, C) serotonin in WT and PKU mice after six weeks of receiving different dietary treatments. Numbers of mice on normal chow, LNAA supplemented diet, and high-protein diet were n = 13, n = 12, and n = 14 for WT mice respectively, while being n = 15, n = 13, and n = 15 for PKU mice. Untransformed data are expressed as mean ± SEM. **p<0.01; §§ p<0.01 compared to WT mice on normal chow.