Figure 4

Highly significant heat stress homology groups. The number of highly significant (p < 10⁻⁶) differentially expressed homology groups regulated by heat stress (y-axis) increased when more species were included in the analysis (x-axis). The figure was created by performing a cross-species analysis for all possible configurations containing n species (with 1 ≤ n ≤ 8). For each fixed value of n, the average number of highly significant p-values were calculated. The error bars shows the corresponding standard deviations. The dashed curve was calculated by performing the same analysis on homology groups with randomized homology groups (the sizes of the homology groups were fixed).