Two fruit flies tachykinin fight (IMAGE) Salk Institute Caption A male fly (left) with an excess amount of tachykinin attacking a female fly (right)—a behavior unlikely when tachykinin levels are normal. 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.