During liver diseases, various cells, such as hepatocytes, macrophages, and endothelial cells, secrete cytokines and chemokines (CC motif chemokine ligand 2 [CCL2], CC motif chemokine ligand 5 [CCL5], CXC motif chemokine ligand 10 [CXCL10], and so on) to recruit hepatic immune cells, especially macrophages, to the injury sites (4, 5). The gene discussed is CCL5; the disease is liver disorder.