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Effect of EEHDW on HT-29 cell survival. Cells were treated with indicated concentrations of EEHDW for 24 h. Cell survival was determined by colony formation analysis. The data were normalized to the survival of control cells. Data are averages with SD (standard deviation; error bars) from at least three independent experiments. *P<0.05, versus control cells. EEHDW, ethanol extract of Hedyotis diffusa Willd.
