Cell CycleS Phase Cell Cycle CheckpointsG2 Phase Cell Cycle CheckpointsG1 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsCell Cycle ProteinsG2 PhaseCell Cycle CheckpointsDNA DamageCheckpoint Kinase 2S PhaseG1 PhaseGenes, cdcAtaxia Telangiectasia Mutated ProteinsMitosisProtein-Serine-Threonine KinasesTumor Suppressor Protein p53Protein Kinasescdc25 PhosphatasesDNA RepairCyclin-Dependent Kinase Inhibitor p21DNA-Binding ProteinsCDC2 Protein KinasePhosphorylationCyclinsCell DivisionApoptosisTumor Suppressor ProteinsCyclin B1Cell Line, TumorDNA ReplicationGamma RaysNuclear ProteinsAtaxia TelangiectasiaHydroxyureaRadiation, IonizingCell ProliferationCyclin BSpindle ApparatusRetinoblastoma ProteinRadiation ToleranceSignal TransductionFlow CytometryG0 PhaseCyclin-Dependent Kinase 2MutationHeLa CellsCell LineCyclin-Dependent KinasesGenomic InstabilityCyclin-Dependent Kinase Inhibitor p27Ultraviolet RaysCyclin D1Cyclin ESaccharomyces cerevisiae ProteinsSaccharomyces cerevisiaeCell SurvivalSchizosaccharomycesNocodazoleMolecular Sequence DataFibroblastsTumor Cells, CulturedSchizosaccharomyces pombe ProteinsModels, BiologicalDNA Breaks, Double-StrandedRNA, Small InterferingHistonesCyclin-Dependent Kinase 4Chromosomal InstabilityBlotting, WesternFungal ProteinsCells, CulturedAntineoplastic Agents, PhytogenicDNACell NucleusBRCA1 ProteinMimosineAntineoplastic AgentsAllyl CompoundsInterphaseAmino Acid SequenceGenes, p53CDC2-CDC28 KinasesKinetochoresAphidicolinCyclin ATranscription FactorsProtein BindingDose-Response Relationship, RadiationBase SequenceIntracellular Signaling Peptides and ProteinsTime FactorsDNA Repair EnzymesMethyl MethanesulfonateGene Expression Regulation, NeoplasticCaffeineCarrier ProteinsChromatinDose-Response Relationship, DrugPolyploidy