Exposure to UVC resulted in persistent mtDNA damage in larval C. elegans. Main effects of treatment, time, genome, and all interactions were significant (p ≤ 0.0002). At 0, 3, and 24 h after the last exposure, DNA damage was statistically significant in both genomes. At 48 h, DNA damage was detected in mtDNA (p = 0.0009) but not nDNA (p = 0.82). Note different y-axis scales. n = 4–11 in two experiments.