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Age-dependent vascular gene expression levels of Nox2, p22phox, Nox1, and endothelial NO synthase (eNOS). Steady-state mRNA levels in the carotid artery and in the aorta from young and aged mice (4 and 24 months of age) were determined by quantitative PCR. *p < 0.01 vs. carotid artery; † p < 0.05 vs. young. All data (n = 4 per group) represent mean ± sem. nd not detectable
