The dN/dS for genes in gene regulatory networks are listed in
Table 1. The gene regulatory network is composed of transcription
factor (TF) and non-TF proteins. Most TF genes are utilized for diverse
interactions, and the DNA binding domains of all of them are highly
conserved across Bilateria. We average the dN/dS of all proteins in
each hierarchical level, and the result is shown in Fig. 3. The value of