Figure 1. Retinal dopamine and 3,4-dihydroxyphenylacetic acid (DOPAC) levels in euthanized mice. A: Retinal dopamine levels in mice euthanized through carbon dioxide overdose were significantly different compared to those in mice euthanized through cervical dislocation (Student t test, p=0.003, n=5 for each group). B: Retinal 3,4-dihydroxyphenylacetic acid (DOPAC) levels between mice euthanized through carbon dioxide and those through cervical dislocation were similar (Student t test, p=0.119, n=5 for each group). The amount of retinal dopamine or DOPAC (ng) was normalized to the amount of retinal protein (mg) for each sample. Data expressed as mean± standard error of the mean (SEM).