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Knockdown of MMP-7 expression in LAC A549 cells. After LAC A549 cells were transfected with siMMP-7 lentivirus for 24 h, the expression level of MMP-7 was detected by real-time PCR (A) and Western blot assays (B,C), indicating that the expression of MMP-7 could be knocked down in siMMP-7 group compared with CON and NC groups (**P<0.01).
