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. 2014 Aug 1;4:5910. doi: 10.1038/srep05910

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Healthy (A) and glaucomatous (B) optic nerve cross-sections stained with 2% toluidine blue, revealing sectorial damage. Areas of glaucomatous damage are marked with arrows (B); scale bar = 500 μm. (C,D): High magnification microscopy of healthy (C) and glaucomatous (D) optic nerves revealed multiple neuropathic features, including (D) axon swelling (cross, #), phagocyte infiltration (arrow) and fields with gliosis (asterisk, *); scale bar = 10 μm. The graphs present the number and density of optic nerve axons.