JNK Protein (IMAGE) University of Turku Caption Blocking activation of the JNK protein in synapses stops synapses from retracting. Temporal colour coding shows that when the JNK protein is inhibited in synapses using a light beam, a structural protein called "actin" freezes in time. Changing the cells cytoskeleton is part of an array of molecular events that JNK triggers to destabilize synapses. Credit Turku Bioscience 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.