Transmission of Tangles (image) University of Pennsylvania School of Medicine Caption These are neurons filled with tangles (arrows) in medial region of hippocampus one month after injection of synthetic tau fibrils into the hippocampus. Scale = 50um. Credit Michiyo Iba, Ph.D., Perelman School of Medicine, University of Pennsylvania Usage Restrictions None 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.