Figure 2From: Cigarette smoke exposure inhibits extracellular MMP-2 (gelatinase A) activity in human lung fibroblastsCytotoxicity assay of HFL-1 cells after exposure to CSE for 24 and 48 hrs. Data are represented as mean (with the indication of SEM) of three replicate experiments. Statistical significance of differences has been evaluated by Kruskal-Wallis test.Back to article page