Fig. 4

DNA damage measured within a nuclear and b mitochondrial DNA from different tissues of zebrafish of different ages. Error bars indicate standard deviation of three replicate measurements from the same DNA, for each of which there were three replicates of the PCR. Significance (in comparison to 5 months using a two-tailed t test): *p < 0.05; **p < 0.01; ***p < 0.001