Protein analysis of ERK1/2 phosphorylation and FosB expression in striatal tissue. Protein levels were evaluated by western blotting the striatal extracts from each group of mice. (A, B) Phospho-ERK1/2 (A) and FosB (B) signals were observed in the ipsilateral sides of striata. Representative bar graph showing optical densities from the blotting experiments. *P < 0.05 and **P < 0.01 compared with the 6-OHDA control (Cont) group. #P < 0.05 and ##P < 0.01 compared with the LID group.