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. 2021 Jan 26;383(1):301–325. doi: 10.1007/s00441-020-03377-5

Fig. 2.

Fig. 2

Structure of the anuran main olfactory epithelia and the adaptations to aquatic and terrestrial environments. The cellular components of a water-type (left) and air-type (right) olfactory epithelium are shown. While the water epithelium contains both ciliated and microvillous receptor neurons, only ciliated receptor neurons are found in the air type epithelium. The water epithelium has two types of supporting cells (ciliated and secretory), compared to only secretory supporting cells in the air epithelium. Mucus in the water- and air-epithelium is mainly produced by secretory supporting cells and Bowman’s glands, respectively. Both epithelial types include a population of basal stem cells near the basal lamina. OBP olfactory binding protein