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Let-7a regulates NF-κB and MAPK/ERK pathway in a KRas-dependent manner in breast cancer cells (A and B) The protein expression levels were determined in MCF-7 and SKBR3 cells transfected lenti- let-7a and/or KRas-siRNA by western blot. (C and D) The protein expression levels were determined in MCF-7 and SKBR3 cells transfected lenti- let-7a and/or KRas by western blot.
