Protein–protein interaction networks of the 78 differentially expressed proteins identified in IPEC-J2 cells upon PDCoV infection. The networks were built using the STRING database with a minimum interaction score of 0.4 at medium confidence. Each node denotes a protein in the graph; each line is indicative of the interaction between two proteins, and the thicker the line, the closer the mutual relationship. The width of the edges represents the predicted strength of functional associations.