Detection of TSPAN33 in Human PBMCs by Flow Cytometry. Human peripheral blood mononuclear cells (PBMCs) either (A) untreated or (B) treated overnight with Recombinant Human IL-4 (Catalog # 204-IL ) and Recombinant Human CD40 Ligand/TNFSF5 (Catalog # 6245-CL ) were stained with Mouse Anti-Human TSPAN33 Monoclonal Antibody (Catalog # MAB8405) followed by Allophycocyanin-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # F0101B ) and Mouse Anti-Human CD19 PE-conjugated Monoclonal Antibody (Catalog # FAB4867P ). Quadrant markers were set based on control antibody staining (Catalog # MAB0041 ).