Nadell predator resistance (IMAGE) Dartmouth College Caption Colonies of the bacterium V. cholerae (purple) insulate E. coli (yellow) from its natural predator. Credit James Winans Usage Restrictions N/A License Original 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.