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Perturbed DNA replication either activates a cell cycle checkpoint, which halts DNA replication, or decreases the rate of DNA synthesis without activating a checkpoint. Here we report that at low doses, replication inhibitors did not activate a cell cycle checkpoint, but they did activate a process that required functional Bloom's syndrome-associated (BLM) helicase, Mus81 nuclease and ataxia telangiectasia...
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