(A, B) Retinal sections from 5-month-old mice were stained with indicated antibodies. Thickness of each layer, number of Brn3a positive cells (retinal ganglion cells) per section and length of outer segment as indicated by opsin staining are quantified. Data information: ONL: outer nuclear layer; INL: Inner nuclear layer; OPL: outer plexiform layer; IPL: inner plexiform layer; GCL: ganglion cell layer. 