Tyrosine (TYR) effects on striatal DA levels ex vivo. (A) Traces
of stimulated DA from striatal slices following bath application of increasing
concentrations of L-TYR with inset cyclic voltammogram. (B) Peak stimulated DA
levels after incremental increases in L-TYR. (C) Peak stimulated DA (%
baseline) after L-TYR 3.125 μM, L-TYR 25 μM or D-TYR 25
μM. (D) Peak stimulated DA(% baseline) after quinpirole (QUI)
0.66 μM alone or with L-TYR 25 μM. (Mean ± SEM, n
= 5 per group). Significantly different from TYR 3.125 μM
(* p < 0.05, **
p < 0.01). Significantly different from other
groups, a, (* p < 0.05). Significantly
different from baseline, († p < 0.05). Mean
± SEM. n = 5/group.