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Exposure to UV radiation in sunlight causes DNA changes in skin cells. Why are these changes more harmful when they occur in an individual with xeroderma pigmentosum (XP) than in an individual who does not have this disorder?1. Compared to XP individuals, non-XP individuals have more effective nucleotide excision repair enzymes.2. XP individuals have significantly more thymines in their DNA than non-XP individuals do.3. XP individuals' DNA replication machinery incorporates more incorrect nucleo

Rare disease 'xeroderma pigmentosum' keeps kids in shadows

Dry skin - Symptoms and causes