In addition, chemokines also play a part in the fibrotic process of various injury models, for example, theCXCL12-CXCR4 chemokine axis is involved in liver fibrosis (Qin et al., 2018), and CCL2 is involved in pulmonary fibrosis in lung injury (Li et al., 2013). Here, CCL2 is linked to pulmonary fibrosis.