Figure 2. The histologic structure and ultrastructure of transplanted submandibular glands. All submandibular gland tissues were removed on post-operative day 7. (A) Histologic structure of a control submandibular gland. An acinar cell is indicated by an arrow. (B) Histologic structure of transplanted gland. Acinar cells show size reduction (arrow). (C) Histologic structure of phenylephrine-treated gland. Acinar cells show only mild size reduction (arrow). Light microscopy, magnification 400x. Bars (A,B,C): 20 µm. (D) Ultrastructure of control submandibular gland. Low-matrix-density secretory granule in acinar cell is indicated by an arrow. (E) Ultrastructure of transplanted submandibular gland. The low-matrix-density secretory granules (arrow) were decreased as compared with those in the control submandibular gland. (F) Ultrastructure of phenylephrine-treated gland. The low-density secretory granules (arrow) are similar to those in the control submandibular gland. TEM magnification, 5000x. Bars (D,E,F): 2 µm.