Human peripheral blood mononuclear cells stained with ab23552 (right) or mouse IgG1 kappa (ab170190) isotype (left). Human peripheral blood mononuclear cells were incubated for 30 min on ice in  1x PBS containing 10 µg/ml human IgG and 10 % normal goat serum to block FC receptors and non-specific protein-protein interaction followed by the antibody (ab23552) or mouse IgG1 kappa (ab170190) (1x10⁶ in 100 µl at 1 µg/ml) for 30 min on ice. The secondary antibody Goat anti-mouse IgG H&L (Alexa Fluor^® 488, pre-adsorbed) (ab150177) was used at 1/2000 dilution for 30 min at 4°C. The cells were simultaneously stained with CD19 APC antibody.

Acquisition of >30,000 events were collected using a 50 mW Blue laser (488nm) and 530/30 bandpass filter. Events were gated on viable lymphocytes.