S8-specific cluster of differentially expressed genes on chromosome 4. The location and relative expression levels of a cluster of differentially expressed genes on chromosome 4 containing a cluster of differentially expressed genes in S8 mice are depicted. FC, fold change, represents the average fold change in S8 relative to SR hippocampus (Hp) and retina (Rt). Those gene-expression changes significant to a p-value ≤ 0.05 (WSRR) are indicated and those genes that were not significantly different are marked as nonsignificant (ns). Chromosomal map position is given in megabases, and both the Affymetrix ID and LocusLink gene symbol are specified. The genes demonstrating upregulation in S8 mice are highlighted in gray.