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LP treatment modulates MMP-1 and TIMP-1 levels in aging skin tissue. MMP-1 and TIMP-1 levels in skin tissue of young mice or aging mice without or with LP-L, LP-M, LP-H, or Vit. E treatment, as determined by western blotting. Glyceraldehyde 3-phosphate dehydrogenase (GAPDH) served as a loading control. Expression levels were quantified by densitometry. Values represent mean ± SD (n = 5). ∗ P < 0.05 and ∗∗ P < 0.01 versus aging model group.
