Figure 4. Effects of PTX treatment on brain oxidative balance in aged rats. (A, B) Effects of PTX treatment on MDA levels in the SN and HIPP of aged rats. (C, D) Effects of PTX treatment on GSH/GSSG ratio in the SN and HIPP of aged rats. Data are expressed as the mean ± S.D. (n=6 rats/group). *P<0.05 versus 6Mon rats, **P<0.01 versus 6Mon rats, #P<0.01 versus 24Mon rats.