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RPA is an important component of DNA replication, repair and recombination, but its involvement in the signaling of cell-cycle checkpoints is not well understood. In this study, we show that knockdown of RPA1 by siRNA duplexes induces ATM (Ser1981) and Chk2 (Thr68), but not Chk1 (Ser345) phosphorylation and results in p21 upregulation in HeLa cells. However, the induction of Chk2 (Thr68) phosphorylation...
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