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Magnetic nanoparticles were delivered via intra-vitreal injection (Panels A-B). (A) Hematoxylin and eosin (H&E) stained section demonstrates blood vessels on the surface of the retina (arrow). Histochemistry using biotinylated alkaline phosphatase shows blue purple reaction product (B) in cells associated with blood vessels that have taken up the MNP. (Bars indicate 40 um.)
