Article 4 DNA Damage 4 DNA Repair 4 DNA damage 4 DNA repair 4 Humans 4 Ultraviolet Rays 4 Xeroderma Pigmentosum 4 clinical feature 4 excision repair 4 genetics 4 human 4 metabolism 4 radiation response 4 ultraviolet radiation 4 xeroderma pigmentosum 4 ATM protein 2 ATR protein, human 2 Adult 2 Ataxia Telangiectasia Mutated Proteins 2 Base excision repair (BER) 2 Child 2 Cockayne Syndrome 2 Cockayne syndrome 2 Comet Assay 2 Comet assay 2 DNA 2 DNA Helicases 2 DNA damage response 2 DNA helicase 2