Figure 1From: Glutathione-S-transferases in lung and sputum specimens, effects of smoking and COPD severityImmunohistochemical staining for GST alpha in specimens from the central and peripheral lung of a non-smoker (A and B, respectively), a smoker (C and D), and patients with Stage I-II COPD (E and F) and Stage IV COPD (G and H). GST alpha was mainly located in the airway epithelium.Back to article page