Normal human peripheral blood cells were stained with CD19 Monoclonal Antibody, eFluor 450 (Product # 48-0199-42) and Mouse IgG1 kappa Isotype Control, PE-eFluor 610 (Product # 61-4714-82) (left) or CD23 Monoclonal Antibody, PE-eFluor 610 (right). Cells in the lymphocyte gate were used for analysis.