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The effect of DKK‐1 overexpression on Wnt/β‐catenin pathway. (A, B) DKK‐1 plasmid transfection in A431 and SCC13 cells. n = 4. *P < 0.05 vs control. (C, D) Analysis of β‐catenin, Sox‐2 and GSK‐3β expression in A431 and SCC13 cells after DKK‐1 overexpression.*P < 0.05 vs control, #P < 0.05 vs DKK‐1 overexpression, $P < 0.05 vs DKK‐1 + C3a
