Diagram of engineered strains of E.coli (IMAGE) University of California - San Diego Caption Diagram of engineered strains including one toxin and two immunity genes. Each toxin targets a different essential biological component of E. coli cells. Credit BioCircuits Institute/UC San Diego Usage Restrictions Credit BioCircuits Institute/UC San Diego 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.