A toolkit for seeing how the fly brain’s visual system works

A complete inventory of the Drosophila visual system classifies about 53,000 neurons into 732 types. The shapes and connections of all the visual neurons have been quantified, and a large collection of genetically engineered fly lines have been shared, providing a comprehensive toolkit for studying fly vision. An inventory of cell types and a connectome of the fly’s optic lobe are improving our understanding of how flies see the world.