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Effect of stem cell factor (SCF) on the expression and activity of matrix metalloproteinase (MMP)-2 and MMP-9. (A) SCF-induced MMP-2 and MMP-9 mRNA expression was measured by quantitative RT-PCR. (B) Western blot analysis of SCF-induced MMP-2 and MMP-9 protein levels. (C) Densitometric analysis of SCF-induced MMP-2 and MMP-9 enzymatic activity. Results are presented as means ± SD. *P<0.05, **P<0.01, ΔP<0.05 and ΔΔP<0.01 versus control.
