Fig. 3
From: Smoking-associated increase in mucins 1 and 4 in human airways
Representative images of the immunohistochemical stainings for MUC4 in bronchial biopsy samples. MUC4 was positive mainly in cells suggesting basal cell and ciliated cell phenotypes, in some cases also in cells with goblet cell phenotype. MUC4 expression in ciliated and basal cells in a Never-smoker (a), a positive expression for MUC4 in the main epithelial cell types in a Smoker (b), an ex-smoker with COPD (c) and a smoker with COPD (d)