Figure 4From: A gallotannin-rich fraction from Caesalpinia spinosa (Molina) Kuntze displays cytotoxic activity and raises sensitivity to doxorubicin in a leukemia cell line Abrogation of clonogenic activity in K562 cells by the P2Et fraction. Cells were treated with the P2Et fraction, ethanol as negative control and etoposide as positive control. Data represents the mean number of colonies ± SE of 3 independent experiments. ***(p < 0.001) versus control.Back to article page