Figure 4. Superoxide levels in A: aorta (n=9-10) and B: mesenteric arteries (n=6) measured in the absence or presence of phorbol-dibutyrate (PdB). Mesenteric artery mRNA expression of NOX2 oxidase subunits C: NOX2 (Gp91phox),D:P47phox and E:P67phox in young and aged mice (n=6-7). All data are mean ± S.E.M. *P<0.05 vs young + PdB, one-way ANOVA with Bonferroni’s post-hoc test.