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Pol ι promotes ESCC cell proliferation in vitro. (A, C) Differentially expressed Pol ι was confirmed by Western blot analysis in two ESCC cell lines with β-actin level as an internal control. The colony formation assay of TE-1 (B) and KYSE-150 cells (D). (E) The EdU incorporation assay, results of NC or shNC cells were served as control and the results of Pol ι up-or down-regulated cells were presented relative to control. *P < 0.05, **P < 0.01, ***P < 0.001.
