Interaction network of 18 macrophage polarization-associated genes as identified by STRING analysis. The results were expanded to the current network by setting the required confidence score to 0.400. The nodes represent the genes, whereas the lines represent interactions between genes. The color of the line denotes the basis of the predicted interaction according to the software database. STRING, Search Tool for the Retrieval of Interacting Genes; Retnla, resistin-like α; Chi3l3, chitinase 3-like 3; Mrc1, mannose receptor C-type 1; Arg1, arginase 1; Nostrin, nitric oxide synthase trafficker; Nos2, nitric oxide synthase 2; Hif1, hypoxia-inducible factor 1; Tnf, tumor necrosis factor; Ccl24, C-C motif chemokine ligand 24; Il, interleukin; Socs, suppressor of cytokine signaling; Irak2, interleukin 1 receptor associated kinase 2; Pparg, peroxisome proliferator-activated receptor.