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Comparison of drug transporter mRNA expression in central airways and peripheral lung tissue. Relative mRNA expression of ABCB1, SLC47A1, SLC22A1, SLC22A4, and SLC22A5, expressed as normalized dCT, in central and peripheral lung tissue from healthy subjects and ex-smokers with COPD. Filled circles denote ex-smokers with COPD, open circles denote healthy subjects, and horizontal lines indicate mean. Statistical significance of difference; * p < 0.05
