Neuron (IMAGE) University of Southern California Caption This is a living neuron in culture. Green dots indicate excitatory synapses and red dots indicate inhibitory synapses. Credit Courtesy of Don Arnold Usage Restrictions For news articles only 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.