Figure 6. POS thickness in Atg5^ΔRPE and Atg7^ΔRPE mice with retinal degeneration. The thickness of the photoreceptor outer segment (POS) was measured in the retinas of the mice at 8–12, 13–18, and 19–24 months of age. Each graph represents data from 1 µm toluidine blue–stained sections of three mice (n = 3) per genotype and age group. On each section, nine data points with 250 µm intervals starting from the optic nerve head were measured, and each data point was the mean of three measurements. The value represents the mean of the data points from three mice ± standard deviation (SD). wt, wild-type control mice.