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Survival rates of oral cancer cell lines (Ca9-22 and SAS) and normal oral fibroblasts (OF) in response to cis-3-O-p-hydroxy-cinnamoyl ursolic acid (HCUA). The structure of HCUA is shown in (A). Ca9-22, SAS, and OF cells were treated with HCUA for 48 h, and then the survival rate of treated cells was calculated based on MTT assays (B). **p<0.01, ***p<0.001 compared with mock cells.
