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Matrigel cell invasion assay (A. Original magnification: 200×) and Western blot assay of MMPs expression (B) in RAECs after transient transfection with SVV and GFP. Results showed the number of invasive cells and the expressions of MMP-2, 7, and 9 increased dramatically in Ad-GFP/SVV group (*P<0.05). MMPs, matrix metalloproteinases; GAPDH, glyceraldehyde 3-phosphate dehydrogenase.
