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A: representative Western blot for MMP-2 in 13-day-old mouse lung WT and MMP-9 (−/−) exposed to room air or hyperoxia. B: densitometry of Western blots of lungs from WT and MMP-9 (−/−) mouse pups. N = 8; bars are means ± SE. MMP-2 signal was normalized to actin. *P = 0.02 compared with room air. Oxygen exposure did not significantly change the level of MMP-2 protein in MMP-9 (−/−) mice.
