CCL19 (MIP-3ß, Beta-chemokine exodus-3, CK beta-11, Epstein-Barr virus-induced molecule 1 ligand chemokine, EBI1 ligand chemokine,ELC, Macrophage inflammatory protein 3 beta, MIP-3-beta, Small-inducible cytokine A19 , C-C motif chemokine 19)

Macrophage inflammatory protein-3-beta (MIP3β) (CCL19), also known as EBI1 ligand chemokine (ELC), directs chemotaxis of dendritic cells, and certain B- and T- lymphocytes, but not monocytes or granulocytes. It is constitutively expressed in thymus and lymph nodes and binds specifically to target cells expressing the receptor CCR7. Being a homeostatic chemokine, its primary physiological role is considered to be in the normal recirculation and homing of lymphocyte. However, MIP3β could also be proinfammatory, and is implicated in the post-HIV infection responses.