Statistics were calculated using Prism (GraphPad v5.0) and SPSS (IBM, v21.0). Error bars indicate the standard error of the mean (SEM). One-way ANOVA was used to examine the significant differences in the experimental data between the groups. P values were indicated in each figures: * P < 0.05, **P < 0.01, *** P < 0.001. P < 0.05 was regarded as significant. All experiments were independently repeated three times.
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