Figure 6. Photopic flash electroretinogram (ERG) recordings. In both Pde6b⁺ mouse lines, we recorded strong responses, with no significant difference in amplitudes. In contrast, the ERGs recorded from the 4-week-old C3H/HeOu mice were markedly weaker with a delayed b-wave that disappeared in older mice. No ERG response was recorded in the FVB/N mice at any time point. For each group, n=6 mice.