Effect of roxithromycin on iNOS expression in SM-exposed SAE (A) and BTE (B) cells. a) control; b) 100 μM SM; c) 100 μM SM + 100 μM roxithromycin. Representative 2D images from each sample are shown. Red spots are signals produced from quantum dots-detected iNOS. The scale bar in each image represents 20 μm.