Representative positron emission tomography images and standardized uptake value (SUV) for [11C]PK11195 of control and transient middle cerebral artery occlusion (tMCAO) rat brain. (A, B) The time course of the progression of the [11C]PK11195 signal at 3 (n=3), 7 (n=3), 14 (n=3), and 28 (n=3) days after tMCAO. The data represent the mean±s.d. *P<0.05, **P<0.01 compared with the control group.