eLife Assessment
This fundamental study comprehensively characterizes insulin producing cells (IPCs) resident in the Drosophila melanogaster brain. A compelling experimental tour de force, the combination of connectomics, mapping of receptors for neuromodulators, electrophysiological recordings, Calcium imaging and optogenetics demonstrates that IPCs operate as a functionally heterogeneous population, as necessary to address continuously changing metabolic demands. These findings will be of interest to both neuroscientists and physiologists seeking to study context-dependent neuroendocrine regulation.