Microglia in anterior cingulate cortex (ACC). (A) Microglial cells were evenly distributed in ACC of control mice, the centrifugally projecting ramified processes of neighbor microglial cells didn't overlap. The arrowhead indicates the monopolarized cell. (B) High power image of the microglial cell indicated by arrowhead in A. Bar = 30 μm in A and 12 μm in B.