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Antioxidant enzyme expression is upregulated by LP treatment in aging skin. Expression levels of (a) MDA, (b) SOD, (c) GSH-Px, and (d) CAT in the skin tissue of young control mice and aging mice without or with LP-L, LP-M, LP-H, or Vit. E treatment, as determined by western blotting. Values represent mean ± SD (n = 12). ∗ P < 0.05 and ∗∗ P < 0.01 versus aging group.
