Fig. 11. The PCNA-positive keratinocytes in wound tissue at day 3 post-surgery. Representative images of immunohistochemical staining of PCNA in the (A) Blank, (B) Vaseline gauze, (C) PVDF and (D) PVDF/NS25 groups. The rectangular insets represent magnified areas, and the black arrows indicate PCNA-positive keratinocytes. (E) The number of PCNA-positive keratinocytes per field in newly generated epidermis. The values are shown as the mean ± SD (n = 4).