Fig. 8.

Transcripts encoding enzymes that metabolize xenobiotic compounds were expressed in sustentacular cells or Bowman’s gland cells. Each panel includes a high-magnification image at left and a low-magnification image at right displaying half the bilaterally symmetric nasal cavity. A,A′: Glutathione S-transferase mu 2 expression in sustentacular cells, Bowman’s glands, and respiratory epithelium (arrowhead). Expression was not detected in sustentacular cells in the dorsal zone (arrow). B,B′: Carbonyl reductase 2 expression in sustentacular cells and respiratory epithelial cells (arrowheads). C: Similar to cytochrome P450 2g1 expression in sustentacular cells and Bowman’s glands. D,D′: Cytochrome P450 2a4 expression in sustentacular cells, Bowman’s glands, and respiratory epithelial cells (arrowhead). Apical is upward in all high-magnification panels. Scale bars = 20 μm in A–D; 250 μm in A′–D′.