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MiR-640 suppressed cell proliferation of BC cells. (A, B) Expression of miR-640 was confirmed by RT-qPCR in MDA-MB-231 and MCF-7 cells. (C, D) Effect of miR-640 on proliferation in MDA-MB-231 and MCF-7 cells by MTT assay. (E, F) Effect of miR-640 on proliferation in MDA-MB-231 and MCF-7 cells by colony formation assay. (G, H) Effect of miR-640 on proliferation in MDA-MB-231 and MCF-7 cells by western blotting. **p < 0.01; ***p < 0.001; ****p < 0.0001.
