Fly Brain Fly-Through (VIDEO) University of California - Berkeley 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 Navigating through a hi-res 3D image of the fruit fly brain. The colored balls indicate the density of synapses on a subset of the neurons in the brain: those that respond to dopamine. The balls summarize the placement of a total of 500,000 synapses, out of 40 million in the entire brain, where red indicates the highest synapse density, purple the lowest. Various brain structures are highlighted. Credit Video footage courtesy of HHMI, postproduction by UC Berkeley Usage Restrictions None 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.