CC chemokine receptor 5 (CCR5), the receptor for CC chemokine ligand 5 (CCL5), macrophage inflammatory protein (MIP)-1α, MIP-1β, and monocyte chemotactic protein (MCP)-2, show strong expressions on FLSs, T cells, and DCs in RA [41]. This evidence concerns the gene CCR5 and rheumatoid arthritis.