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Flow cytometry analyses of BAL T cells of never-smokers (NS), smokers with normal lung function (S) and COPD. CD4+CD25bright are given as percent of gated CD3 (a). CD25+ cells out of CD4+ cells are given as median fluorescence intensity, MFI (b). Significance levels are noted as ** p < 0.01, *** p < 0.001. Data are given as median and IQR.
