Three antibody clones against Zap‐70 (SBZAP, 2F3.2, and 1E7.2) were tested for flow cytometry and Western blot. Anti‐Zap‐70‐PE (SBZAP) was further used for flow cytometry. Cells were fixed with 1% paraformaldehyde (Merck, Germany) for 5 min, washed once with PBS, and permeabilized with 1X Perm II reagent (BD, USA) according to the manufacturer's instructions. The staining panel included either anti‐CD3‐FITC (clone HIT3a, BioLegend), anti‐Zap‐70‐PE (clone SBZAP, Beckman Coulter) and anti‐CD22‐APC (clone S‐HCL‐1, BD), or anti‐CD3‐PE‐Cy7 (clone UCHT1, BioLegend), anti‐CD19‐FITC (clone HIB19, eBioscience), anti‐Zap‐70‐PE (clone SBZAP, Beckman Coulter), and anti‐CD22‐APC (clone S‐HCL‐1, BD).
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