C-C motif chemokine ligand 19 (CCL19) acts as a chemoattractant for T and B lymphocytes, dendritic cells, macrophage progenitor cells and natural killer cells. Therefore, this protein might play an essential role in migration of T cells in the thymus and transfer of T and B cells to secondary lymphoid organs. Overexpression of MIP-3 β (macrophage inflammatory protein-3β)/ C-C motif chemokine ligand 19 (CCL19) leads to pulmonary sarcoidosis.
