Asymmetric cell division is the process by which one cell gives rise to two daughters that have different fate. Asymmetric cell division is the hallmark of stem cells, which generate all the different cell types in the organism. The Derivery Lab in the Cell Biology Division uses the fruit fly to study the molecular mechanism of asymmetric cell division as it is amenable to imaging and genetic modifications. This image for day 323 of #LMB365 represents the back of the fly (called the notum), where all the cells express a cytoskeleton marker in green, while only the cells dividing asymmetrically express a red marker. These cells form a remarkable aligned array, which will give rise to the mechanosensory bristles on the adult fly.