Characterization of the song circuit (VIDEO) Howard Hughes Medical Institute This video is under embargo. Please login to access this video. Caption Video of some of the different genetically engineered flies used to characterize the song circuit. The left image shows light microscopy images from different fly strains expressing different neurons. The right image shows the same neurons identified by electron microscopy in the connectome of the male adult nerve cord. The middle image shows an overlay of the anatomy imaged by light microscopy and electron microscopy. Credit Joshua Lillvis / HHMI Janelia Research Campus Usage Restrictions Please use credit provided. License Original 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.