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MMP-2 activity. (a) Representative SDS-zymography and (b) bar graphs showing MMP-2 activity in serum-free cell culture supernatants of fibroblasts from healthy and overgrown gingivae after densitometric analysis of immunoreactive and lytic bands. Data are expressed as densitometric units and are mean ± SD for samples run in duplicate. ∗p < 0.05.
