Fig. 4: Changes in the short cuircuit current (ISC) in the presence of L-arginine or carbachol in transverse colon mucosa from naïve or MPTP-treated animals.

a L-Arginine (200 µM) and b carbachol (10 µM). Values are mean ± SEM from the numbers of animals shown in parentheses. (a, b) *P ≤ 0.05 compared to vehicle in naïve animals; #P ≤ 0.05 compared to vehicle in MPTP-treated animals (ANOVA with Dunnett’s test).