Etanercept improved amplitudes of all electroretinogram (ERG) waves in β2KO mice. In all panels, data shows results for wildtype (WT) and β2KO (β2KO) mice only or WT and β2KO mice treated with etanercept. In mice treated with etanercept for two months, the ERG amplitudes for A-wave (left), B-wave (middle) and oscillatory potentials (right) were significantly increased over β2KO only mice. Data are mean ± SD for ERG. N = 5 mice for all groups.