Release from the Active Zone (VIDEO) Picower Institute at MIT This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Calcium, tagged green, indicates synaptic releases at synapses labeled (red) for the presence of a glutamate receptor. Credit Littleton lab / MIT Picower Institute 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.