Figure 6. Normal dopamine and DOPAC levels in the IRBP KO mouse compared to the WT mouse. A: Dopamine (DA) levels per eye. Appendix 3, panel B: 3,4-dihydroxyphenylacetic acid (DOPAC) levels. C: DOPAC to DA ratios, respectively. At all time points, DA and DOPAC are the same in the knockout mice (KO) mouse retina as in the wild-type (WT) mouse retina. The ratio of DOPAC to DA remained constant regardless of age or strain.