ONL thickness (in micrometers) at P49 plotted as a function of the retinal location (in millimeters) from the optic nerve head. A, S334ter (⋄), P23H (▵), and wild-type (WT; □) values from untreated rats. Wild-type (B), P23H (C), and S334ter (D) rats were given water (▪), 0.25% PBN in drinking water (○), or 0.25% PBN in drinking water plus three intraperitoneal injections of PBN (100 mg/kg per injection) (×), starting at P21.