Chemokine ligand 3 (CCL3), also known as Macrophage inflammatory protein-1 alpha (MIP-1 alpha) is a small cytokine belonging to the CC chemokine family. CCL3/MIP-1 alpha is a chemoattractant for several different leukocytes, with varying degrees of potency (monocytes = T-cells>neutrophils>eosinophils).