Loss of KRT13 protein in oral squamous cell carcinoma (OSCC) cells. (A) KRT13 protein levels in three OSCC cell lines and HaCaT cells were examined by western blotting. Representative images are shown. Fold change in KRT13 protein was calculated relative to band intensity of the HaCaT cells and normalized to that of β-actin. The means ± SEM for each group (n = 4–5) are shown. Statistical analysis was performed by a one-way analysis of variance followed by Dunnett’s post hoc test. **p < 0.01. (B) Expression of KRT13 (green) was analyzed by immunofluorescence staining, and nuclei were visualized with DAPI staining (blue).