Recombinant Human CCL13/MCP‑4 (Catalog # 327‑P4) chemoattracts the BaF3 mouse pro‑B cell line transfected with human CCR2A 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 Human CCL13/MCP‑4 (2 µg/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human CCL13/MCP‑4 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF327). The ND50 is typically 15‑40 µg/mL.