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A: Curves of intracellular cAMP changes in RKO cells with or without ABCC4 knockdown (P<.05; Error bars, SD). B: The proportion of cell cycle arrested at the G0/G1 phase in RKO cells with or without ABCC4 knockdown (P<.05); while there was no significant difference among the three cell groups without irradiation (P>.05).
