Figure 2: Photographs of NADPH diaphorase histochemistry in the ICS inhalation-only (ICS1, ICS2, and ICS4) and LABA inhalation-only (LABA1, LABA2, and LABA4) groups and shams. Although there were slight increases in the mean density of staining at ICS1 compared with shams, there were no significant increases in the mean density of staining from LABA1 to LABA4. All scale bars indicate 50 μm.