(b) Quantification of the average number of rhabdomeres per ommatidium in Huntington's disease flies with and without pan-neural mGpx1 overexpression at days 1 (n = 14 (Htt93Q); n = 9 (Htt93Q + mGpx1)), 7 (n = 7 (Htt93Q); n = 9 (Htt93Q + mGpx1)) and 10 (n = 8 (Htt93Q); n = 9 (Htt93Q + mGpx1)) after eclosion. Significant effects of genotype (F1,50 = 82.3, P = 3.82 × 10−12) and age (F2,50 = 94.3, P = 1.06 × 10−17) were observed, as well as a significant interaction between genotype and age (F2,50 = 7.76, P = 0.00116), indicating that mGpx1 reduces the rate of neurodegeneration in Htt93Q flies. Post-hoc Newman-Keuls comparisons showed significant rescue of neurodegeneration in mGpx1-expressing flies at days 1 (*P 0.05), 7 (***P 0.001) and 10 (***P 0.001). Browne-Forsythe analyses for equality of variance revealed a significant inequality of variance (P = 0.02) due to a single group (Htt93Q + mGpx1, day 1). The nonparametric Mann-Whitney test confirmed a difference at day 1 between the two groups (P = 0.03), and between Htt93Q + mGpx1 flies at days 1 and 7 (P 0.0001). 