Fig. 3

A photomicrograph of the buccal mucosa. a & d: control group, b & e: aging model group, c & f: aspirin group. (k) keratin layer, (Ep) epithelium, (Lp) lamina propria, (Sm) submucosa, (b) basal cell layer, (p) prickle cell layer, (g) granular cell layer, (pa) papillary layer, (r) reticular layer, white arrows: keratohyaline granules, brown arrows: vacuoles, black arrows: inflammatory cells, asterisk: connective tissue fibers [H&E, a-c: ×100 & d-f: ×400].