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Analysis of Grx1 positive macrophages. The percentage (%) of Grx1 positive macrophages from the total number of alveolar macrophages in healthy non-smokers (NS), smokers without COPD (S), stage I–II COPD and stage IV COPD (for patient characteristics see Table 1). The means of the percentage of positive macrophages are marked with horizontal lines. * Significantly decreased when compared smokers (p = 0.021).
