Stop and Go (IMAGE) University of Pennsylvania School of Medicine Caption Slow transport protein alpha-synuclein moving along an axon (arrowheads mark movement). Credit Subhojit Roy, M.D., Ph.D., University of Pennsylvania School of Medicine 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.