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Rat retinal ganglion cells that have been allowed to regenerate for two months after transection into a grafted peripheral nerve piece and then labeled with 4-Di-10-ASP (D291), which is retrogradely transported within the regenerated axons and finest dendrites (right panel). Microglial cells in the retina were transcellularly labeled with 4-Di-10-ASP after phagocytosing degenerated ganglion cells (left panel). The images were contributed by Solon Thanos, University of Tübingen School of Medicine.