10, 000
10, 000. 10, 000 DNA lesions X 1 trillion cells 10,000,000,000,000,000. DNA damage leads to mutations. DNA damage leads to mutations. 1) toxic chemicals (industrial & environmental). 2) X-rays (clinic). 5) UV rays (sun). 3) viruses (HPV). 4) oxidation (respiration, smoking).
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