Science Image (IMAGE) Salk Institute Caption Researchers studied how sex-determining genes affect neurons known to control courtship (shown in orange on the left) and aggression (shown in blue on the right) in fly brains. Credit Salk Institute Usage Restrictions with credit and related coverage. 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.