Staining of normal human peripheral blood cells with 0.25 µg of Mouse IgG2b kappa Isotype Control Purified (Product # 14-4732-82) (left) or 0.25 µg of Anti-Human CD181 (CXCR1) Purified (right) followed by F (ab')2 Anti-Mouse IgG PE (Product # 12-4012). Cells in the large scatter population were used for analysis.