Figure 2: A semithin section in the submandibular gland of the control group stained with toluidine blue showing metachromatic secretory granules (stars) of varying staining intensity in the acinar cells (A). The cells of serous demilunes are faintly metachomatic (thin arrow) or unstained (thick arrow).The striated duct cells (D) are also unstained. Scale bar=20 μm.