DNA DamageDNA RepairAtaxia Telangiectasia Mutated ProteinsCell Cycle ProteinsDNA Breaks, Double-StrandedDNA Repair EnzymesDNA-Binding ProteinsTumor Suppressor ProteinsProtein-Serine-Threonine KinasesCheckpoint Kinase 2Ultraviolet RaysHistonesRadiation, IonizingGenomic InstabilityTumor Suppressor Protein p53Comet AssayCell CycleNuclear ProteinsGamma RaysBRCA1 ProteinCell Cycle CheckpointsDNA BreaksDNA ReplicationRadiation TolerancePhosphorylationMethyl MethanesulfonateRad51 RecombinaseMutationCell Line, TumorTelomereRecombinational DNA RepairDNA-Activated Protein KinaseApoptosisDNA End-Joining RepairDNAG2 Phase Cell Cycle CheckpointsG2 PhaseSignal TransductionHeLa CellsCell AgingCell LineMutagensGenes, cdcReplication Protein AHomologous RecombinationS PhaseProtein KinasesPoly(ADP-ribose) PolymerasesIntracellular Signaling Peptides and ProteinsTelomeric Repeat Binding Protein 2UbiquitinationDNA Breaks, Single-StrandedSaccharomyces cerevisiae ProteinsRecombination, GeneticChromatinFibroblastsDNA HelicasesDose-Response Relationship, RadiationAntigens, NuclearEndodeoxyribonucleasesMitosisCell SurvivalRNA, Small InterferingChromosomal Proteins, Non-HistoneSaccharomyces cerevisiaeProtein BindingAtaxia TelangiectasiaFanconi Anemia Complementation Group D2 ProteinExodeoxyribonucleasesHydroxyureaMolecular Sequence DataOxidative StressHCT116 CellsTelomere-Binding ProteinsDNA GlycosylasesCell NucleusRNA InterferenceDNA Mismatch RepairModels, BiologicalAlkylating AgentsCyclin-Dependent Kinase Inhibitor p21EndonucleasesChromatin Assembly and DisassemblyCells, CulturedUbiquitin-Protein LigasesFanconi AnemiaRad52 DNA Repair and Recombination ProteinChromosomal InstabilityDNA AdductsPoly Adenosine Diphosphate RiboseLaser Scanning CytometryNeoplasmsUbiquitinCell ProliferationDeoxyguanosineGene Knockdown TechniquesHEK293 CellsSOS Response (Genetics)Proliferating Cell Nuclear AntigenMitomycin