Figure 2 (IMAGE) Institute for Basic Science Caption Laser microirradiation is used to mimic the DSBs in cells and measure the recruitment of green flurecent protein-labeled MSH2 (GFP-MSH2) or EXO1 (GFP-EXO1) to the DNA damage site (indicated by the red line) under a confocal microscope. The recruitment of GFP-MSH2 was inhibited in SMARCAD1-deficient cells, but not in EXO1-deficient cells. The recruitment of GFP-EXO1 was inhibited in SMARCAD1- or MSH2- deficient cells. These data indicates that MSH2 recruitment to DSBs depends on SMARCAD1, and then EXO1 is recruited. 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.