Intracellular cAMP Concentration and Cell Cycle Arrest Following 4 Gy Irradiation.

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