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GFAP expression of retinal Müller cells by immunohistochemistry. GCL, ganglion cell layer; INL, inner nuclear layer; IPL, inner plexiform layer; OPL, outer plexiform layer; ONL, outer nuclear layer; PSL, photoreceptor segment layer, RNFL, retinal nerve fiber layer. Original magnification 400×. Positive cells were stained brownish yellow. Scale bar: 50 μm.
