Cells were grown to ∼70% confluence and reagents were added as indicated. Western blot analysis was performed as described previously (36 (link),37 (link)) with the following antibodies: phospho-SRC (Y416), phospho-STAT3 (T705), and SRC (Cell Signaling Technology, Inc., Boston, MA, USA), ALDH1A1 (Abcam, Cambridge, UK), Poly-ADP-ribose-polymerase (PARP; BD Biosciences, Franklin, NJ, USA), α-tubulin and β-actin (Sigma, St. Louis, MO, USA).
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