Figure 3.

Skin wound after 6 days of healing in nondiabetic rats. (a) Control wound (1—granulation tissue contains a small amount of collagen). (b) Wound treated by power density, 1 mW/cm² (1—granulation tissue with newly formed collagen, arrows marked new vessels). (c) Wound treated by 5 mW/cm² (1—granulation tissue contains significant amount of new collagen, arrows marked new vessels). (d) Wound treated by 15 mW/cm² (1—granulation tissue contains significantly the greatest amount of new collagen, arrows marked new vessels). VG stain; scale bar represents 200 μm.