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Summary Ataxia telangiectasia is a hereditary pleiomorphic syndrome caused by loss of Atm, a phosphoprotein involved in multiple signaling pathways. Here, we propose a novel role for atm in cultured epithelial cells, namely the regulation of cell growth by contact inhibition. We show that atm is upregulated in epithelial cells reaching confluence. Conditional expression of the PI 3-Kinase domain of...
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