What causes xeroderma pigmentosum?

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Tags

1. #causes
2. #pigmentosum
3. #usually
4. #smoke
5. #normal
6. #problems
7. #cigarette
8. #found
9. #before
10. #repairing
11. #toxic
12. #caused
13. #xeroderma
14. #genes
15. #cells
16. #mutations
17. #damaged
18. #those
19. #damage
20. #chemicals
21. #involved