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Unformatted text preview: correct nucleotides, assuming there is an undamaged DNA strand to serve as the template. Even so, some mistakes do not get repaired. About 1 in 1 billion DNA base pair errors are not caught. Such DNA changes are known as mutations. Deterioration of DNA replication accuracy is likely a contributing factor in aging and in cancer. Exposure to UV light can cause DNA damage, which is why those who tan are at greater risk for skin cancer....
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