Purity > 90% as determined by SDS-PAGE. MW: 24.7kDa. Full Length of Mature Protein: 20-93aa. N-terminal 6xHis-SUMO-tagged. Homo sapiens (Human). Has weak activities on human monocytes and acts via receptors that also recognize MIP-1 alpha. It induced intracellular Ca2+ changes and enzyme release, but no chotaxis, at concentrations of 100-1,000 nM, and was inactive on T-lymphocytes, neutrophils, and eosinophil leukocytes. Enhances the proliferation of CD34 myeloid progenitor cells. The processed form HCC-1 (9-74) is a chotactic factor that attracts monocytes eosinophils, and T-cells and is a ligand for CCR1, CCR3 and CCR5.