SUV39H2 knockdown induced apoptosis. (A) Assessment of caspase 3 activation by Western blot and (B) representative figure showing Annexin V and PI staining post SUV39H2 siRNA(#2 and 4) or control siRNA transfection in Jurkat, CEM, REH, and RS4;11 (the numbers represent the percentage of total cells). (C) Graphical quantification of average Annexin V and PI staining results in Jurkat, CEM, REH, and RS4;11 from two independent experiments. Data are presented as mean ± SE; P values were calculated using Student’s t test (*P < .05; ** P < .01; ***P < .001).