Fig. 4

Both SFT and FST genes form tightly interconnected modules. a Epidermal scale-to-feather transition (SFT) genes form a tightly interconnected module (STRING, number of edges: 169, expected number of edges: 119, PPI enrichment p-value = 1.14 X 10^− 5). b Epidermal feather-to-scale transition (FST) genes form a tightly interconnected module (STRING, number of edges: 101, expected number of edges: 62, PPI enrichment p-value = 3.57 X 10^− 6). Edges are protein–protein interactions in the STRING database. Thicker lines indicate higher strength of data supporting these interactions. Unidentified and unlinked genes are not shown. The color used for nodes has no particular meaning