Back skin tissues of mice (1 cm2) were collected, fixed with neutral buffered formalin (NBF) for 24 h, and embedded in paraffin. Paraffin blocks were cut into 3 μM thick sections and stained with hematoxylin and eosin (H&E) using a standard protocol (Abion CRO, Seoul, Korea). Epidermal thickness was measured at the thickest part of five different dorsal epidermis specimens per mouse group, and significant differences between each pair of conditions were analyzed.
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