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Effect of aging and sepiapterin treatment on endothelial nitric oxide synthase (eNOS) dimers/monomers in the penis. Upper panel is a representation of western immunoblot of the dimers/monomers in the penis of young vehicle-, young sepiapterin-, aged vehicle- and aged sepiapterin-treated rats. Lower panel represents quantitative analysis of eNOS dimer/monomer ratio. Each bar represents the mean ± s.e.m. of 4–6 rats; *P<0.05 vs young vehicle. Veh, vehicle; Sep, sepiapterin.
