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Flow cytometric analysis of CD68 expression by human peripheral blood monocytes. Human peripheral blood mononuclear cells were fixed with BD Cytofix™ Fixation Buffer (Cat. No. 554655). After washing with BD Perm/Wash™ Buffer (Cat. No. 554723), the cells were stained with either PE-Cy™7 Mouse IgG2b, κ Isotype Control (Cat. No. 560542; dashed line histogram) or PE-Cy™7 Mouse Anti-Human CD68 antibody (Cat. No. 565595; solid line histogram). The fluorescence histogram showing CD68 expression (or Ig Isotype control staining) was derived from gated events with the forward and side light-scatter characteristics of intact monocytes. Flow cytometric analysis was performed using a BD™ LSR II Flow Cytometer System.