Purity > 90% as determined by SDS-PAGE. MW: 41.2kDa. Full Length of Mature Protein: 24-150aa. N-terminal GST-tagged. Homo sapiens (Human). Potentially involved in T-cell development. Recombinant protein shows chotactic activity on thymocytes, macrophages, THP-1 cells, and dendritics cells but is inactive on peripheral blood lymphocytes and neutrophils. Binds to CCR9. Isoform 2 is an antagonist of isoform 1. Binds to atypical chokine receptor ACKR4 and mediates the recruitment of beta-arrestin (ARRB1/2) to ACKR4.