Figure 1. Experimental design of the study and behavior test by Kurlan rating scale. (A) A progressive intoxication protocol of MPTP from 0-22w, MPTP withdraw period from 22-25w, and treatment period from 25-29w. IM: Intramuscular injection; IV: Intravenous injection. (B) Longitudinal evaluation (in weeks) of motor function by Kurlan rating scale for each monkey during the MPTP intoxication and withdraw period.