Fig. 2. Representative photomicrographs of three independent individuals for the control and smoker groups stained with 8-hydroxy-2′-deoxyguanosine (8-OHdG), ciclooxigenase-2 (COX-2), metalloproteinases (MMP) 2 and 9, and vascular endothelial growth factor (VEGF). Scale bars = 50 μm.