mtDNA copy numbers fluctuated and eventually became normalized during continued short-term exposure (6h).

Relative quantities (%) of mtDNA compared to control animals. Numbers between parentheses indicate 95% confidence intervals (51df) from ≥3 replicates per 2 individual experiments. Significance was determined using a two-tailed student’s t-test assuming unequal variance compared to control animals. * = P-value以对照动物为参照的线粒体DNA（mtDNA）相对含量（%）。括号内的数值为2次独立实验中每组≥3次重复所得的95%置信区间（自由度51，51df）。显著性差异采用双侧学生t检验（假设方差不齐），以对照动物为参照进行比较计算得出。* 代表P值（P-value）。