Fig. 4

Quantitative motor behavioral analysis based on the open field test. a The rats in the sham group walked a greater distance, compared to the 6-OHDA-injected animals. The motor function of the 6-OHDA rats was significantly improved by 5 mg/kg DP. b Track plots of the open field test at weeks 0 and 5 after injury. DP was applied intraperitoneally at the dosage of 5 mg/kg daily for 5 weeks after injury. *P < 0.05, **P < 0.01, compared to the 6-OHDA group;    ^##P < 0.01, compared to the sham group; ANOVA. Data are expressed as mean ± SD, n = 5 in each group