ATR promotes homologous recombination <i>in vitro</i>.

<p><i>I-SceI</i>-induced HR-mediated repair was significantly decreased in the DR-GFP U2OS cell line with reduced ATR expression (<b>A</b>). For (<b>A</b>) ***<i>P<0.001</i> and n = 3. (B) A representative image of ATR expression knockdown using siRNA in the DR-GFP U2OS cells (siCtr is scramble).