(a) Nondysplastic hyperkeratotic oral epithelium (magnified in the box, H&E, 10x) and the submucous odontogenic epithelial cell islands (H&E, 2,5x); (b) Less mature odontogenic island with vacuolated oval to polyhedric cells (H&E, 40x); (c) ameloblastomatous nest composed by peripheral palisading columnar and central polyhedric cells (H&E, 20x); (d) budding projection in an ameloblastomatous island (circle) (H&E, 20x).