Chemokine (C-C motif) ligand 9 (CCL9) is a small cytokine belonging to the CCchemokine family. It is also called macrophage inflammatory protein-1 gamma (MIP-1γ),macrophage inflammatory protein-related protein-2 (MRP-2) and CCF18, that has been described in rodents. CCL9 has also been previously designated CCL10, although this name is no longer in use. It is secreted by follicle-associated epithelium (FAE) such as that found around Peyer's patches, and attracts dendritic cells that possess the cell surface molecule CD11b and the chemokine receptor CCR1.