Overexpression of Inducible Nitric Oxide Synthase in Allergic and Nonallergic Nasal Polyp

Figure 2

iNOS expression in normal (a), allergic nasal polyp (b), and nonallergic nasal polyps (c). Photomicrograph (×1000) of immune-histochemistry location of iNOS expression in normal nasal mucosa (a) showing few positive cells in the stroma (arrow). Notice the absence of the expression in the epithelial cells (arrowhead). Allergic nasal polyp (b) showing numerous positive cells in the epithelium (arrow) and stroma (arrowhead). Nonallergic nasal polyps (c) showing low expression in the epithelial cells (arrow) and nearly negative expression in the stroma.

(a)

(b)

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