E Annexin‐V staining of 1G4‐CD8 cells re‐expressing a SHP1 tail tyrosine mutant. Jurkat 1G4‐CD8 cells were transduced with Knock‐down/re‐expression constructs for HA‐SHP1 wild‐type (wt) or Tyr536/564 to Phe double mutant (YYFF). Cells were stimulated and analysed by flow cytometry as in (B). Data shown are representative of three independent experiments. n = 3, means ± SD are shown. 