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Effects of gene silencing of thymidine kinase 1 (TK1) on apoptosis and cell cycle. A, B, There was no statistical difference on the percentage of apoptotic cells and apoptosis‐related proteins between two groups. C, D, Western blot indicated increased P21 was responsible for S phase arrest which was induced by TK1 knockdown. * represents P < .05, and ** represents P < .01
