Recombinant Cotton Rat CCL3/MIP‑1 alpha (Catalog # 1061‑RM) chemoattracts the BaF3 mouse pro‑B cell line transfected with human CCR5 in a dose-dependent manner (orange line). The amount of cells that migrated through to the lower chemotaxis chamber was measured by Resazurin (Catalog # AR002). Chemotaxis elicited by Recombinant Cotton Rat CCL3/MIP‑1 alpha (10 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Cotton Rat CCL3/MIP‑1 alpha Antigen Affinity-purified Polyclonal Antibody (Catalog # AF1061). The ND50 is typically 0.1-0.4 µg/mL.