Fig. 3. Immunoblotting of caveolin 1 and caveolin 2. Western blot analysis revealed bands at 20 kDa corresponding to caveolin 1 and caveolin 2 proteins. Anti-GAPDH antibody recognized the 42 kDa band. The protein expression of both caveolin 1 and 2 was significantly decreased in the old-aged group than in the young age control group. The lower panels denote the mean±standard deviation of 5 experiments for each condition determined by densitometry relative to GAPDH. ^*p<0.05.