Science illustration (IMAGE) Salk Institute Caption Salk scientists discovered a gene and group of cells that prevent escalated aggression in the brains of fruit flies. Credit Salk Institute Usage Restrictions with credit and related coverage. 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.