DNA Damage 8 DNA damage 8 Genotoxic stress 8 Humans 8 controlled study 8 DNA Repair 6 DNA damage response 6 DNA repair 6 Up-Regulation 6 apoptosis 6 article 6 human 6 human cell 6 metabolism 6 protein expression 6 upregulation 6 Animals 4 Apoptosis 4 Blotting, Northern 4 Cell Line 4 Cell Line, Tumor 4 Phosphorylation 4 Transcriptional Activation 4 Ultraviolet Rays 4 animal cell 4 cell cycle arrest 4 cell survival 4 gene expression 4 genetics 4 genotoxicity 4