KRT17 and cyst: Altogether, four specimens of three patients showed partially or fully retained palisading of the basal layer of the thicker non-keratinizing epithelial lining (Cases K1 - biopsy and surgically removed cyst, K5 and S15c, Table 2, Fig. 3), and in three samples, these areas seemed to show the typical OKC epithelium staining pattern with bcl2, CK10 and CK17 positivity (Fig. 3).