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Multiparameter flow cytometric analysis of CD3 expression on Human peripheral blood leukocyte populations. Human whole blood was stained with either BD Horizon™ RB705 Mouse IgG1, κ Isotype Control (Cat. No. 570261; Left Plot) or BD Horizon™ RB705 Mouse Anti-Human CD3 antibody (Cat. No. 570237/570238; Right Plot). The erythrocytes were lysed with BD Pharm Lyse™ Lysing Buffer (Cat. No. 555899). The bivariate pseudocolor density plot showing the correlated expression of CD3 (or Ig Isotype control staining) versus side light-scatter (SSC-A) signals was derived from gated events with the forward and side light-scatter characteristics of viable leukocytes. Flow cytometry and data analysis were performed using a BD FACSymphony™ A5 SE Flow Cytometer System and FlowJo™ software.