Figure 2. Cleaved caspase 3 is increased in knockout animals. Enzyme-linked immunosorbent assay (ELISA) analyses of whole retinal lysates from β1-adrenergic receptor knockout (KO) animals versus their wild-type (WT) littermates. Caspase 3 levels are increased in the knockout mice KO animals. *Significance was found at p<0.05 versus wildtype samples. Animal numbers (N) is equal to 6.