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The mean relative expression level of candidate genes in human lung fibroblasts as determined by QRT-PCR. QRT-PCR was performed on total RNA isolated from human lung fibroblasts. Open bars, normal lung (n = 2); filled bars, emphysema lung (n = 6). Significant difference between emphysema and normal lung fibroblasts is shown (*, P < 0.05; **, P < 0.01).
