Figure 1

MMP-12 mRNA analysis by real time quantitative polymerase chain reaction (PCR) in lung of Balb/c (blank bars) and C57BL/6 mice (solid bars), removed one day or 14 days after intranasal administration of bleomycin (BLM) or vehicle saline (Control). Results are presented as mean ± SEM of the ratio of the number RNA copies in the unknown sample in comparison to the calibrator. *: P < 0.05 compared to corresponding control. N = 3–5.