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Immunocytochemistry against astrocyte-specific protein GFAP. Representative micrographs of rat neocortex reveal the extensive network of glial cells and their processes which make contact and surround blood vessels. Small, round, stained cells in B–D are red blood cells non-specifcally stained from the DAB chromagen. Higher magnification of panel C is shown in panel D. Scalebars in microns: A, 250; B–C, 42; D, 25.
