CASP9 and lymphoma: The percentages of lymphoma cells that were positive for activated caspase 9 activities were hWJSC-CM (21% O2): 27.8 ± 1.37%, hWJSC-CM (10% O2): 26.0 ± 1.08%, hWJSC-CM (5% O2): 36.3 ± 0.9%, and control: 13.8 ± 0.50%.