Anticoagulant (image) Salk Institute Share Print E-Mail Caption In the top image an inert red dye injected into the circulation of normal mice remains confined within blood vessels (green) of the brain. Whereas in the bottom image the same red dye injected into the circulation of mice with a 50 percent reduction in the level of Protein S leaks out of brain vessels (green), and leaches into the surrounding brain tissue. Credit Image: Courtesy of Tal Burstyn-Cohen Usage Restrictions News media reproduction to illustrate this story permitted with proper attribution as provided above. For one time use only. Share Print E-Mail 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.