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Dkk1 could abrogate the protective effect of pentazocine on MPP+-induced SN4741 cells apoptosis. Cells were treated as described in Figure 2A. (A) Annexin V-FITC/PI was performed to examine the cell apoptosis. (B) Percentages of apoptotic SN4741 cells in every group (the means ± SEM; n = 3; **p < 0.01).
