Purity > 90% as determined by SDS-PAGE. MW: 35.8kDa. Full Length of Mature Protein: 22-98aa. N-terminal GST-tagged. Homo sapiens (Human). May play a role not only in inflammatory and immunological responses but also in normal lymphocyte recirculation and homing. May play an important role in trafficking of T-cells in thymus, and T-cell and B-cell migration to secondary lymphoid organs. Binds to chokine receptor CCR7. Recombinant CCL19 shows potent chotactic activity for T-cells and B-cells but not for granulocytes and monocytes. Binds to atypical chokine receptor ACKR4 and mediates the recruitment of beta-arrestin (ARRB1/2) to ACKR4.