Figure 3.

Photomicrographs of cryosections of the pylorus (a–c), duodenum (d–i), and colon (j–l) of the tiger showing angiotensin-converting enzyme 2 immunoreactivity (ACE2-IR). (a–c) Arrows indicate two pyloric glands in which weak ACE2-IR was expressed by the epithelial cells. (d–f) Arrows indicate two duodenal crypts in which epithelial cells expressed moderate ACE2-IR. (g–i) Stars indicate the submucosal plexus neurons of the duodenum co-expressing ACE2- and HuC/HuD-immunoreactivity. (j–l) Arrows indicate some epithelial cells of the colonic intestinal glands expressing moderate ACE2-IR. Bar: 100 μm.