A. Representative image of a Drosophila posterior midgut showing the expression of Armadillo (red membranes), Prospero (red nuclei of EEs) and Dronc-TurboID (green shows Streptavidin labelled proteins by Dronc-TurboID); note the preferential enrichment of Streptavidin staining is preferentially enriched in the intestinal progenitor cells (white arrows indicate an intestinal progenitor cell upregulating Dronc). 