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Expression of MsrA and Sp1 in MCF7 and MDA-MB231 cells. (A) MsrA mRNA levels were evaluated after RT-PCR of mRNA samples obtained from MCF7 and MDA-MB231 cells, as described. (B) a representative Western blot showing MsrA (26 kDa) and Sp1 (105 kDa) protein levels.
