Enzyme MPO Kills Bacteria (IMAGE) University of Basel Caption The enzyme MPO produces an aggressive acid which burns a hole into the bacterial cell envelope and kills the bacterium without damaging the surrounding tissue. Credit (Image: University of Basel, Biozentrum) 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.