Blood Brain Barrier (IMAGE) Southwest Research Institute Caption SwRI developed a new screening method (on the right) that uses in vitro brain cells to identify potential drug formulations, depicted in blue and green, that can penetrate the brain’s complex and highly selective blood-brain barrier with hydrodynamic forces to simulate movement or a heartbeat. Credit Southwest Research Institute Usage Restrictions Images/Videos may be used by the public for educational and informational purposes only. 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.