Figure 3. Effect of SS31 on mitochondrial genetic stability through the AMPK signaling pathway. The mitochondrial DNA (mtDNA) in each group of 661W cells was quantified by droplet digital PCR, and the absolute copy number of the mtDNA was analyzed by Quant-Drop quantification software to identify positive and negative droplets. *Significantly different from H₂O₂, p < 0.05. **Significantly different from H₂O₂, p < 0.01. n = 6.