CpG-1-PTO and nCpG-5-PTO amplify staurosporin-induced caspase 9 activity and cytoplasmic histone-assosiated DNA fragments in HaCaT cells—CpG-1-PTO protects RAW264.7 cells from apoptosis. HaCaT cells were treated with 8 µM CpG-1-PTO or nCpG-5-PTO in the presence of 0.1, 0.5 and 1 µM staurosporin (STS). ( A ) After 24 h caspase 9 activity was assessed using a commercial assay as described under 'Materials and Methods' section. Each bar represents the mean of four parallel experiments; the standard deviations are indicated (* P