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(a, b) Immunofluorescence staining against CD31 (endothelial cells) and GFAP (astrocytes) to show their spatial relationship in the rat brain. Note the processes (arrowheads) of astrocytes wrapping blood vessels and their overlap. Patches of blood vessels without CD31-positive signal were observed (arrows). The scale bar is 20 μm in (a) and 10 μm in (b).
