Activity dependence and role of JNK in driving LD accumulation and retinal degeneration in ADAM17-/- mutants.Figure 6A-B. Fluorescent images of 1 day old adult fly retinas, stained with BODIPY (green) and FM-dye (red) to mark lipid droplets and photoreceptor membranes respectively: (A) wild type; (B) ADAM17-/-, both reared in the dark. Scale bars: 10μm. C-F. TEM images of 4 week old retinas: (C, D) wildtype, or (E, F) ADAM17-/- flies reared from first larval instar either in total light (C, E) or total dark (D, F). Scale bars: 10μm. G. Quantitation of the BODIPY signal shown as integrated total lipid from 1 day old retinas corresponding to the genotypes described in A-B, all reared in the dark. n=10 for each. The box end points represent the upper (75%) and lower (25%) quartiles, the whiskers define the maximum 95th percentile and minimum 5th percentile values respectively, the central band is the median and the square is the mean. Data were quantified for significance using Student's t test. **p<0.01. H. Percentage of normal, abnormal and missing rhabdomeres in the genotypes and treatments mentioned above. n=180 ommatidia from 3 different fly retinas for each. Data were quantified for significance using Student's t test. **p<0.01. I. Measurement of MDA levels (in nmoles) from 1 day old retinas of wild type or ADAM17-/- , reared either in light or dark. Four biological replicates with 3 technical replicates for each genotype. The box end points represent the upper (75%) and lower (25%) quartiles, the whiskers define the maximum 95th percentile and minimum 5th percentile values respectively, the central band is the median and the square is the mean. Data were quantified for significance using Student's t test. **p<0.01. J. mRNA levels of the puckered transcripts from retinas of untreated or AD4 treated wild type and ADAM17-/- mutant retinas. n=3 biological replicates, with 3 technical replicates for each genotype. The box end points represent the maximum and minimum values respectively, the central band is the median and the square is the mean. Data were quantified for significance using Student's t test. **p<0.01. K-L. Fluorescent images of 1 day old adult fly retinas, stained with BODIPY (green) and FM-dye (red) to mark lipid droplets and photoreceptor membranes respectively: (K) heterozygous mutant of bsk alone; or (L) in combination with ADAM17-/-. Scale bars: 10μm. M. Quantitation of the BODIPY signal shown as integrated total lipid for the genotypes mentioned in K-L, along with w1118 and ADAM17-/-. n=10 flies per genotype. The box end points represent the upper (75%) and lower (25%) quartiles, the whiskers define the maximum 95th percentile and minimum 5th percentile values respectively, the central band is the median and the square is the mean. Data were quantified for significance using Student's t test. **p<0.01. N-O. TEM images of 2 week old adult retinas, showing clusters of ommatidia for a heterozygous mutant of bsk alone (M) or in combination with ADAM17-/- (N); n=3 for each. Scale bars: 10μm. P. Percentage of normal, abnormal and missing rhabdomeres for the genotypes mentioned above; n=180 ommatidia from 3 different fly retinas for each. Data were quantified for significance using Student's t test. **p<0.01.