CCL2 and infection: The cytokines retrieved from M9809 gene set of Molecular Signatures Database in Gene Set Enrichment Analysis (GSEA) (Subramanian et al., 2005), such as IL-7, CCL2, CXCL10 and IFNs, were significantly up-regulated in cerebral cortex, but markedly down-regulated in cerebellum and right ventricle post infection (Fig. 6A).