Research Article
Oleanolic Acid Enhances the Beneficial Effects of Preconditioning on PC12 Cells
Figure 3
Graph showing the synergistic effect of OA and 6-OHDA on preconditioned PC12 cells assessed by the Annexin V assay of apoptotic cells. (Untreated group versus Group 2, ), (Group 2 versus Group 3, ), and (Group 3 versus Group 4).