A Chemical that Is Supposed to Kill Bacteria Is Actually Making them Stronger (image) Washington University in St. Louis Share Print E-Mail Caption This is E. coli from the strain used in this study. The cell wall is shown in red and DNA is shown in blue. Credit Petra Levin laboratory, Washington University in St. Louis Usage Restrictions None Share Print E-Mail 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.