Chemokine (C-C motif) ligand 12 (CCL12) is a small cytokine belonging to the CCchemokine family that has been described in mice. It is also known as monocyte chemotactic protein 5 (MCP-5) and, due to its similarity with the human chemokine MCP-1, sometimes it is called MCP-1-related chemokine. CCL12 specifically attractseosinophils, monocytes and lymphocytes.