Western blot analysis of DHPR-α voltage-dependent Ca2+ channel, Kv1.2 potassium channel and myosin heavy chain (MHC) β-isozyme distribution in male young or old FVB and catalase (CAT) transgenic mouse hearts. Panel A: actual gel blots depicting protein expression using specific antibodies; Panel B-D: expression of DHPR-α, Kv1.2 and β-MHC. Mean ± SEM, n = 4 – 5 samples per group, * p < 0.05 vs. FVB-young group, # p <0.05 vs. FVB-old group.