F-I. Immunofluorescence images of dpERK staining of midgut sections of the R4 region of 40-day Drosophila (F), 40-day Drosophila with ALA administration (G), 14-day Drosophila carrying esgts-GAL4-driven UAS-lacZ (H), and Drosophila carrying esgts-GAL4-driven Las RNAi (I). dpERK (red). J. Quantification of the fluorescence intensity of dpERK in experiments (F-I). Each dot corresponds to one cell. n is indicated. The numbers of quantified guts from left to right are 11, 12, 12, and 13. K Data information: DAPI stained nuclei are shown in blue. Scale bars represent 10 μm Error bars represent SDs. The statistical tests used in other panels were student's t-tests. *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001, and non-significant (NS) represents p > 0.05. 