PXN and cyst: In this study, PXN staining was positively detected in epithelial lining of the cyst and cytoplasm of tumoral cells and in all layers of epithelial lining of DC (Figure 1),and the basal and parabasal layers of lining in OKC (Figure 2).In unicystic ameloblastoma (Figure 3) and solid ameloblastoma (Figure 4),PXN staining was seen in both ameloblast-like and stellate reticulum-like cells.