Figure 5. Effect of norbixin early curative supplementation from 9 to 15 months in Abca4-/- Rdh8-/- mice. (A) Schematic representation of the 6-month early curative supplementation protocol design. (B) Scotopic A wave, (C) Scotopic B wave, (D) Photopic B wave ERG recorded after 6 months of oral supplementation with norbixin in Abca4-/-Rdh8-/- mice compared to mice fed with normal chow (vehicle) and to 1.5 and 9-month-old mice. (E) Quantification of photoreceptor nuclear layers along the superior and inferior poles of the retina each measured every 200 μm apart from the optic nerve. (F) A2E quantification in eyes from 9-month-old Abca4-/- Rdh8-/- mice, 15-month-old mice fed with normal chow or with norbixin-containing pellets. Bars represent mean ± s.e.m. with n = 6 per group (i.e. n=12 eyes for the norbixin treated group and n=11 eyes for the vehicle treated group for ERG). *p<0.05, **p<0.01, ***p<0.001, ****p<0.0001 compared to vehicle (One-way ANOVA, Dunnett's post-test).