Brain gene expression as determined using the 32 × 3 Custom RT2 Profiler PCR array. Gene expression, for the mock infected group (PBS) and the time point groups, is given as fold regulation, compared to the control naive group, for complement components (A), MHC class I and II antigens (B), chemokines (C), cytokines (D), and other genes (E) with expression increased more than twofold from control. Note the changes in scale for the y-axis from graph to graph. MHC, major histocompatibility complex; PBS, phosphate-buffered saline; PCR, polymerase chain reaction.