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Expression of autophagy and ER stress‐related genes in breast cancer cells treated with metformin for 24 h. (A) mRNA expression as determined by qPCR (mean ± SEM of duplicate experiments). *P < .05 vs control, **P < .01 vs control and ***P < .001 vs control. (B) Protein expression as measured by Western blot analysis. Grayscale analysis for Western blot could be seen in Figure S4
