GRO-alpha/CXCL1 protein attracts neutrophils and potentially contributes to inflammation through autocrine effects on endothelial cells. Processed forms of GRO-alpha, including GRO-alpha (4-73), GRO-alpha (5-73), and GRO-alpha (6-73), exhibit 30-fold greater chemotactic activity than the full-length protein. Animal-Free GRO-alpha/CXCL1 Protein, Human (His) is the recombinant human-derived animal-FreeGRO-alpha/CXCL1 protein, expressed by E. coli , with N-His labeled tag. This product is for cell culture use only.