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DNA double-strand breaks (DSB) mobilize DNA-repair machinery and cell cycle checkpoint by activating the ataxia-telangiectasia (A-T) mutated (ATM). Here we show that ATM kinase activity is inhibited by poly(ADP-ribose) polymerase-1 (PARP-1) in vitro. It was shown by biochemical fractionation procedure that PARP-1 as well as ATM increases at chromatin level after induction of DSB with neocarzinostatin...
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