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Mitochondrial DNA deletions in cultured keratinocytes derived from patients grouped according to high and low sunburn history. The relative levels of the CD (black bars) and Δuv (white bars) normalized to undeleted genomes in skin samples from patients who reported either 0–1 severe sunburns (n = 7) or 2–7 severe sunburns (n = 19) are indicated (±SEM).
