Supplementary Figure 6: Microarray strain effects across four tissues.

Balanced contribution of different subspecies to the identification of genes with additive strain effects using microarray data. For each tissue, a Venn diagram shows the degree to which additive strain effects are shared by multiple crosses. For example, in brain, 74% of all expressed genes (9,701/13,162) showed a strain effect in at least one cross (FDR < 0.05), with the majority identified in at least 2 crosses. Also shown for each tissue is a distribution of the effect size (a positive value indicates higher expression from the alphabetically second strain for each cross) for all genes with a strain effect, separated by cross.