Figure 4. PPI network, modular analysis, and miRNA-mRNA network construction. The PPI network of 101 target genes of the 29 exo-miRNAs was analyzed using the STRING database (A) and Cytoscape software (B). (C) The key module was identified from the PPI network using the MCODE plug-in of Cytoscape. (D) The hub genes (degree: top 10) identified by the Cytohubba plug-in. (E) miRNA-hub gene network. In the miRNA-hub mRNA network, the pink ellipses represented hub genes, and the green triangles represented key miRNAs.