Neurotransmitter release (VIDEO) Howard Hughes Medical Institute 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 Neurons with defective syt1 proteins release lower than normal amounts of neurotransmitters, shown as flickering above. When given the drug 4-AP, the cells sent out more neurotransmitters and their brightness increased. Credit Mazdak Bradberry Usage Restrictions Must use 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.