a. Schematic of cryosectioning brains 30um thick. Several sections in the middle are chosen for image analysis. b. Stroke only, immunohistochemistry (IHC) stains 15 days after stroke. Astrocytes (GFAP+) cells are shown in red, microglia (Iba1+) are green, and vessels (GLUT1+) are white. Stroke + Hydrogel condition, IHC 10d post injection, 15 days after stroke. Astrocytes (GFAP+) cells are shown in red, microglia (Iba1+) are green, hydrogel material is white.