Nsb1 Molecules (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The last piece of the MRN puzzle falls into place: Nsb1 molecules extend from the DNA repair machine like two flexible arms, as revealed by recent research at Berkeley Lab's Advanced Light Source. In this illustration, the MRN complex bridges a DNA double-strand break where the green and blue DNA sections meet. Credit Tainer lab Usage Restrictions None 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.