Representative skin sections stained with H&E to show the migration of proliferating epidermal cells at the second (x 100), fourth (x 200), and eighth (x 100) days after wounding for the different groups. The epidermal tongues directed toward the entire wound region are shown in these sections. Histograms show the percentage of the original wound size covered by migrating epidermal cells. Values shown are means ± SD. *shows the significance in comparison with the control group. # shows the significance in comparison with the older group.