Recruitment and activation of astrocytes. Representative GFAP immunostain images from the vehicle injection group at days 1 (A), 3 (B), and 7 (C) illustrating the combination of local GFAP activation and cellular recruitment from the SVZ (through the corpus callosum). CC = Corpus callosum, LV = Lateral ventricle. Red = GFAP, Green = CXCR4, Blue = DAPI. Scale bar = 500 μm. White line designates injection track.