In vitro cytotoxicity as determined by the MTS assay and apoptosis by the annexin V staining. Shown are results for Daudi (A), Raji (B), RL and DoHH2 (C), and the annexin V binding assay for Daudi (D). The concentrations of each primary antibody and GAH (C) were 10nM and 10 μg/mL, respectively.