Fig. 4From: Primary peri-implant oral intra-epithelial neoplasia/carcinoma in situ: a case report considering risk factors for carcinogenesisImmunohistological findings show a negative staining mosaic pattern for keratin 13 (k13) and positive staining for keratin 17 (k17) (immunohistological staining, bar 400 μm)Back to article page