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Multicolor flow cytometric analysis of CX3CR1 expression on human peripheral blood lymphocytes. Whole blood was treated with BD Pharm Lyse™ Lysing Buffer (Cat. No. 555899) to lyse erythrocytes. After washing, the leucocytes were stained with BD Horizon™ BUV737 Mouse Anti-Human CD56 antibody (Cat. No. 564447; Top Plots), BD Horizon™ BV421 Mouse Anti-Human CD3 antibody (Cat. No. 562426/562427; Bottom Plots), and either Alexa Fluor® 647 Rat IgG2b, κ Isotype Control (Cat. No. 557691; Left Plots) or Alexa Fluor® 647 Rat Anti-Human CX3CR1 antibody (Cat. No. 565894/565895; Right Plots). Two-color flow cytometric contour plots showing the correlated expression of CD56 or CD3 versus CX3CR1 (or Ig Isotype control staining), were derived from gated events with the forward and side light-scatter characteristics of viable lymphocytes. Flow cytometric analysis was performed using a BD LSRFortessa™ Flow Cytometer System.