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Histological section of a normal adult Sprague–Dawley rat retina stained with toluidine blue. Three vertical bars on the left show the assignments of the three MRI-derived layers. GCL, ganglion cell layer; IPL, inner plexiform layer; INL, inner nuclear layer; OPL, outer plexiform layer; ONL, outer nuclear layer; IS+OS, inner and outer photoreceptor segment; CH, choroidal vascular layer.
