A) CFSE-labeled effector T cells (Teff) were cultured together with either unlabeled autologous effector T cells or Tregs at effector:suppressor ratios of 1:1 or 4:1 in the presence (+) or absence (−) of a bsAb and the respective target antigen. B) Cytokine secretion of bsAb-activated Teff in the presence (white bars) or absence (black bars) of autologous bsAb-activated Tregs.