I-L. Representative images of the midgut section from the R4 region of Drosophila carrying esgts-GAL4-driven expression of lacZ cDNA (I), Las RNAi (J), Las RNAi and CAT cDNA (K), or Las RNAi and Keap1 RNAi (L). 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 