Figure 5. The protein-protein interaction (PPI) network of Pdgfb was represented. A Pdgfb involved PPI network was retrieved from the online tool STRING with an interaction score of > 0.4 (a median confidence). According to mammalian phenotype ontology, 45 proteins were reported as directly interacted with Pdgfb, among which 17 proteins were already implicated in eye and visual-related traits. Nodes represented proteins and edges represented the interaction confidence between two nodes.