Calcium Channels Are Key (IMAGE) Picower Institute at MIT Caption Top: Calcium channels (tagged green) along a neuron in a fly neuromuscular junction. Below: A map of active zone activity: Warmer colors indicate higher release probability with red being greater than 0.3 and deep blue being less than 0.1. 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.