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The expression levels of circMMP11 and ZEB2 in breast cancer tissues and cells. a, b The relative expression level of circMMP11 was determined by RT-qPCR assay in breast cancer tissues and cells, along with in matched controls. c–f The RT-qPCR and western blot assays were performed to assess the expression of ZEB2 in breast cancer tissues and cells. *P < 0.05, **P < 0.01, ***P < 0.001
