(A) Locomotor tracks of 5 dpf larvae treated 24 hr with 0.2 % DMSO, 500 µM CBE, 10 µM olmesartan, and 500 µM levodopa. The background subtraction method was used to identify and track movement for 5 min duration. (B) Quantification of total distance (in millimeters, mm) travelled during 5 min recordings for each sample group. Drugs were added at the indicated concentrations and incubated for 24 hr before behavioral recording (n = 12–13; *p < 0.05, ***p < 0.001, unpaired t test) (C) Confocal images of TH-immunoreactive DA neurons (red) and 5HT-immunoreactive serotonin neurons (green) in 6dpf larval zebrafish brains after treatments as indicated in (B). (D–E) Quantification of neurons in the demarcated regions as shown in (C). Fluorescent intensity was quantified using ImageJ and normalized against the control (0.2% DMSO) (n = 8; *p < 0.05, **p < 0.01, unpaired t test).
