Fig. 6.

Representative images of the immunohistochemical stainings for EGFR 2. Expression of EGFR2 in cells suggesting basal cell and ciliated cell phenotype in the large airways of a Never-smoker with normal lung functions (a), a Smoker with normal lung function (b), MUC1 expression in basal cells of an ex-smoker with COPD (c) and a Smoker with COPD (d). EGFR2 scores of all subjects in basal cell phenotype (e) and in ciliated cell phenotype (f). Results are shown as median bars and standard error of median