Figure 3. Effects of PTX treatment on dopamine and its metabolites in the aged rat brain. (A–C) Effects of PTX treatment on DA, DOPAC, and HVA in the CPu of aged rats. (D–F) Effects of PTX treatment on DA, DOPAC, and HVA in the HIPP of aged rats. Data are expressed as the mean ± S.D. (n=6 rats/group). *P<0.01 versus 6Mon rats, #P<0.05 versus 24Mon rats, ##P<0.01 versus 24Mon rats.