Figure 4. Venn diagram analysis of genes predominantly expressed in dorsal trunks or primary, secondary and terminal branches with those involved in defence responses (A) or regulated by hypoxia (B).

The sets of genes predominantly expressed in dorsal trunks or primary, secondary and terminal branches were compared with those linked to immunity (A) or responses to hypoxia (B). The numbers of genes found in both sets is listed in the intersecting regions. Statistical analyses were performed with Fisher’s exact test, the corresponding p-values are listed close to the intersections.