Monocyte Chemotactic Protein 3 (MCP-3), also called CCL7, is produced by macrophages and some tumor cell lines. MCP-3 signals through three different G Protein-coupled receptors, CCR1, CCR2, and CCR3. CCL7 chemoattracts monocytes and can regulate macrophage function. Recombinant MCP-3 is a non-glycosylated Protein, containing 74 amino acids, with a molecular weight of 8.5 kDa