The CD49d⁺ population of human neutrophils expresses uniquely high levels of CXCR4 and VEGFR1. Representative flow cytometry plots of human neutrophils isolated from blood, (A) gated in forward-scattered light (FSC)/side-scattered light (SSC) and (B) on CD16 expression, and (C) labeled with mAb toward CD49d. (D-G) Representative histograms and quantified mean fluorescence intensities (MFIs) of the CD49d⁺ and CD49d^– neutrophils after staining with CXCR4 and VEGFR1 mAbs (n = 8-12 healthy human individuals). *P < .05.