Those are the Breaks (IMAGE) Brown University Caption Isolated bright spots show double-strand DNA breaks fatal to bacteria. More are evident in the middle (treated with hydrogen peroxide) and the right (treated with norfloxacin) than in the untreated E. coli on the left. Credit Belenky lab/Brown University Usage Restrictions with credit 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.