Rosenthal fibers (IMAGE) University of Wisconsin-Madison Caption A hallmark of Alexander disease is the buildup of abnormal proteins called Rosenthal fibers, pictured here (red) in brain tissue from a study of a rat model of the disease. The study identified a potential treatment and helped provide early data for a human clinical trial now underway. Credit Hagemann et al./Alexander Disease Lab Usage Restrictions None 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.