Cell CycleCell Cycle ProteinsDNA DamageCheckpoint Kinase 2Cell Cycle CheckpointsG2 PhaseGenes, cdcAtaxia Telangiectasia Mutated ProteinsProtein-Serine-Threonine KinasesMitosisS PhaseG2 Phase Cell Cycle CheckpointsDNA RepairG1 PhaseTumor Suppressor Protein p53Protein KinasesTumor Suppressor ProteinsDNA-Binding ProteinsGamma RaysM Phase Cell Cycle CheckpointsAtaxia TelangiectasiaRadiation, IonizingNuclear ProteinsDNA Replicationcdc25 PhosphatasesHydroxyureaPhosphorylationCyclinsCyclin-Dependent Kinase Inhibitor p21Spindle ApparatusCDC2 Protein KinaseCyclin BRadiation ToleranceApoptosisCell DivisionGenomic InstabilityMutationG1 Phase Cell Cycle CheckpointsUltraviolet RaysSaccharomyces cerevisiae ProteinsSchizosaccharomycesCyclin B1S Phase Cell Cycle CheckpointsCell Line, TumorCell LineSignal TransductionDNA Breaks, Double-StrandedNocodazoleHeLa CellsSchizosaccharomyces pombe ProteinsSaccharomyces cerevisiaeFibroblastsRetinoblastoma ProteinChromosomal InstabilityBRCA1 ProteinModels, BiologicalFlow CytometryHistonesCyclin-Dependent Kinase 2Molecular Sequence DataFungal ProteinsGenes, p53DNACell NucleusCell ProliferationKinetochoresTumor Cells, CulturedCell SurvivalMethyl MethanesulfonateDNA Repair EnzymesIntracellular Signaling Peptides and ProteinsCyclin ECells, CulturedMimosineRNA, Small InterferingCDC2-CDC28 KinasesCyclin-Dependent KinasesProtein BindingCaffeineAmino Acid SequenceDose-Response Relationship, RadiationCyclin AAphidicolinNucleic Acid Synthesis InhibitorsTime FactorsPolyploidyCentrosomeMetaphaseHCT116 CellsThioguanineCyclin-Dependent Kinase Inhibitor p27BlastulaMutagensCyclin D1Antineoplastic AgentsCarrier ProteinsBase SequenceChromosome BreakageExonucleasesChromatin