Figure 4

Duplication subgraphs are organized hierarchically in the WGD network. See the duplication subgraph legend in Fig. 2. Left panel: scheme of the hierarchical organization of the ancestral network's links. The numbers refer to the links found in each component. The "core" is the component formed by the set of links involved in feedback loops. The rest of the network is made up of feed-forward, tree-like components that are placed upstream or downstream of the core, or run "beside" it by connecting roots to leaves. Right panel: distribution of DSs in the hierarchical components of the network, scored by the WGD one-shot null model. The feedback core is enriched with all nontrivial DSs, the upstream part with α and β DSs, and the downstream part with γ DSs.