D-F. Immunofluorescence images of the midgut section from the R4 region in Drosophila carrying esgts-GAL4-driven UAS-lacZ (D, control), Las RNAi (E), or Las RNAi in response to ALA administration (F). esg-GFP (green) indicates ISCs and their differentiating cells. Dl staining (red) was used to visualize ISCs. Data information: DAPI stained nuclei are shown in blue. Scale bars represent 10 μm 