Abstract:The physical nature of mechanisms by which cells sense radiation-induced DNAstrand breaks remains to be elucidated. The fast induction of, for example, ATM kinase activity immediately after exposure to ionizing radiation, suggests that it acts at an early stage of signal transduction. Existing data indicate that ATM activation is not dependent on direct binding to strand breaks. However, some fundamental questions are still not responded to, such as: how ATM directly senses structure disruption in "relaxed" ch… Show more
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