B. A representative example of a 7 d intestine reared at 29 Co in experimental conditions that protect the epithelial integrity and labelled with ReDDM cell-lineage tool. esg (green cytoplasmic signal) labels intestinal progenitor cells, whilst Histone-RFP (red nuclear signal) acts as a semi-permanent marker that allows the visualization of differentiated cells. Note the extensive overlap between the two markers and the absence of differentiated cells only showing the Histone-RFP labelling, as an indication of negligible epithelial turnover. The image on the left was acquired at low magnification with the 10x objective, while the right panel was acquired using the 40x. White dotted line outlines the gut using DAPI staining (not shown) as a reference. Genotype: w1118; esg-Gal4 UAS-CD8-GFP (Irene Miguel Aliaga)/ Cyo; UAS-Histone-RFP (BL7019) TubG80ts (BL7019 C. Quantification of intestinal cell subpopulations labelled with ReDDM system at high magnification (GFP and Histone-RFP) and different time points post ReDDM activation (3- and 7-days) in experimental conditions that protect the epithelial integrity; note that none of the cell populations in the gut (GFP (n.s. no significant , P = 0.5267) or Histone-RFP (n.s. , P =0.2752) significantly increase in number overtime (Quantifications were made using N ≥ 2 biological replicates, total number of guts analysed at 3 days n =34 and at 7 days n=45; Mann-Whitney, C). Error bars represent Standard Error of the Mean. Genotype: w1118; esg-Gal4 UAS-CD8-GFP (Irene Miguel Aliaga)/ Cyo; UAS-Histone-RFP (BL7019) TubG80ts (BL7019) 