Figure 2

Photomicrographs of Snail1 expression representing 4 different study groups: (A) healthy non-smokers (N-C), (B) smokers with normal lung function (NLFS), (C) current smoking COPD (COPD-CS) and (D) ex-smokers with COPD (COPD-EX). Original magnification, ×400. Scale bar = 50 µm.