Arc in Action (IMAGE) Picower Institute at MIT Caption Image of a dendrite (a branch of a neuron) with round processes or spines, expressing a red fluorescent protein together with a green tag for the protein Arc, obtained with two-photon microscopy in an awake mouse. Credit Sur, et. al. Usage Restrictions with credit 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.