Methanolic extracts of G. tenuistipitata (MEGT) induced mitochondrial membrane potential (MMP) changes of Ca9-22 oral cancer cells. (A) Flow cytometry-based MMP profiles for MEGT-treated cells. Cells treated with different concentrations (0 to 1 mg/ml) of MEGT for 24 h. (B) Quantification analysis of DiOC2(3)-intensity for MMP. Data are presented as mean ± S.E. (n = 3). Differences between treatments of different concentrations containing the same letter are not significant.