Nitric Oxide Synthase Enzymes in the Airways of Mice Exposed to Ovalbumin: NOS2 Expression Is NOS3 Dependent

Figure 8

Immunohistochemical stain of NOS2 protein in 5 $\mu$m thick left lung sections from C57Bl/6 (a) filtered air-exposed and (e) OVA-exposed mice, NOS1${}^{-/-}$ (b) filtered air-exposed and (f) OVA-exposed mice, NOS2${}^{-/-}$ (c) filtered air-exposed mice, and NOS3${}^{-/-}$ (d) filtered air-exposed and (g) OVA-exposed mice. Airway smooth muscle layer is indicated by arrow. Images were taken at 400$\times$ magnification.

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