Put to the Test (IMAGE) Rockefeller University Caption To confirm that a defect in RAD51 interfered with cells' ability to fix misplaced links between DNA strands, researchers treated patient cells with an agent to cause such links to form. The cells failed to repair them, producing broken chromosomes that fused with one another (red arrows). Credit Laboratory of Genome Maintenance at The Rockefeller University/Molecular Cell Usage Restrictions Image may only be used to illustrate research described in the accompanying story. License Licensed 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.