Oxidative stress marker. a. Protein carbonyl levels were measured in the cytosolic fraction of the ischemia reperfused hearts of young WT, aged WT, young CYP2J2 Tr and aged CYP2J2 Tr mice. Values represent mean ± SEM; n=3 per group; *, p<0.05 vs. WT; #, p<0.05 vs. young animal of same genotype. b. 8-iso-PGF2α levels in the heart perfusate collected duting last 20 min of baseline. Values represent mean±SEM; n=3–6 per group; *, p<0.05 vs. WT.