Drosophila Brain (IMAGE) University of California - Riverside Caption Image depicting the effect of the steroid hormone ecdysone on brain development in a fruit fly. The green color shows the cell layer that forms the blood-brain barrier, which physically separates the fruit fly brain from the circulation. Credit Naoki Yamanaka / UCR Usage Restrictions None 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.