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Immunohistochemical scores for cell-bound MUC1 were calculated based on the intensity and extent of the staining. Scores for immunohistochemical expression of MUC1 in basal cells of large airways from smokers (including COPD) and Never-smokers and from ex-smokers with COPD. MUC1 scores in all subjects (a), and scores separately in males (b) and females (c). Results are shown as mean bars with standard error of mean
