Piceatannol induces morphological changes and cell death in U2OS cells. (A) U2OS cells were incubated with various concentrations of piceatannol for 24 h and cellular morphology was observed under microscope. (B) U2OS cells were treated with different concentrations of Piceatannol for 24 h. Cells were stained with Hoechst 33258 and nuclear morphological changes were examined by fluorescence microscopy.