ERG Flicker analysis of control (WT), visual arrestin knockouts (Arr4−/−, Arr1−/−, Arr-DKO), +p48Arr1−/−, or −p48Arr1−/− mice. (A) Representative 10-Hz flicker responses of WT and visual arrestin knockout mice measured after 16 minutes of background illumination. (B) 10-Hz flicker responses of WT, Arr4−/−, Arr1−/−, Arr-DKO, and p48 transgenic mice (+p48Arr1−/−) and their negative littermate controls (−p48Arr1−/−). Two-way ANOVA with Bonferroni posttests compared transgenic mice with WT mice (*P < 0.05).