Figure 5. Phosphorylation status of selected MAPK and mTOR pathway components on protein level in rat liver tissue as determined by Western blot. (A) Original bands, (B) Densitometric analysis of three rats per age group expressed as fold of β-actin depicted as mean ± SD. Significant differences (determined by One-way ANOVA) to the young group (* p<0.5, ** p<0.1, *** p<0.01) or between adult and aged rats (# p<0.05) are indicated.