Figure 2 (IMAGE) Institute for Basic Science Caption The survival curves of different DNA repair mutants treated with increasing TMZ concentrations. In this graph, the WT (green) is the TMZ-sensitive tumor. The blue lines are the MMR-deficient mutants, which are a hundred times more resistant than the WT line. Note how knockout of XRCC1 and APE1 genes restores the TMZ sensitivity of the MMR mutants. Credit Institute for Basic Science Usage Restrictions Attribution Required License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.