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Human retina, postmortem photomicrograph. (Hematoxylin and eosin stain; ×40.) (A) Normal. (B) Advanced glaucoma. Note loss of retinal ganglion cells (arrow in A) and retinal nerve fiber layer (axons of retinal ganglion cells; asterisk in A) and their replacement by glial tissue (arrow in B) in the glaucomatous retina.
