Active zone model (IMAGE) Picower Institute at MIT Caption A model of active zone construction: Numerous proteins arrive over time during development to ultimately build a structure for releasing neurotransmitters. 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.