Figure 11: Percentage PAS positive cells present in the airway epithelium from C57Bl/6, NOS1-/-, and NOS3-/- genotype mice exposed to filtered air or OVA. Filtered air-exposed mice displayed an average of 0.45% PAS positive cells with no difference between the three groups. OVA-exposed NOS1-/- mice had significantly fewer PAS positive-stained cells compared to the OVA-exposed C57Bl/6. Data are presented as mean values±SEM; ** denotes P<.01 by ANOVA.