Figure 3. Pyogenic (teleangiectatic) granuloma on the gingiva stained for keratin 19. Note staining in almost the entire epithelium which represents pathologically non-cornified oral gingival epithelium. In epithelial dysplasia, a staining pattern similar to this one has been reported; however, in normal oral non-cornified epithelia, keratin 19 is variably detectable in the basal cell layer only. X100.