Figure 2: The total of apoptotic cells was determined using Annexin V-FITC and PI staining after treatment with xanthone or with combination of xanthone and caspase inhibitor (CI). The values are shown as the mean ± SEM ( ). Significant difference in the total apoptotic cells between xanthone alone and combination of xanthone and CI is presented as * ( ) and ** ( ). C stands for untreated control.