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 PhosphatasesCyclin-Dependent Kinase Inhibitor p21DNA RepairCDC2 Protein KinaseDNA-Binding ProteinsCyclinsPhosphorylationCell DivisionApoptosisTumor Suppressor ProteinsCyclin B1Cell Line, TumorDNA ReplicationGamma RaysNuclear ProteinsAtaxia TelangiectasiaHydroxyureaRadiation, IonizingCell ProliferationCyclin BSpindle ApparatusRetinoblastoma ProteinRadiation ToleranceFlow CytometryG0 PhaseCyclin-Dependent Kinase 2Signal TransductionHeLa CellsCell LineMutationCyclin-Dependent KinasesCyclin-Dependent Kinase Inhibitor p27Genomic InstabilityCyclin D1Cyclin EUltraviolet RaysSaccharomyces cerevisiae ProteinsCell SurvivalNocodazoleSaccharomyces cerevisiaeSchizosaccharomycesTumor Cells, CulturedFibroblastsSchizosaccharomyces pombe ProteinsDNA Breaks, Double-StrandedRNA, Small InterferingCyclin-Dependent Kinase 4HistonesChromosomal InstabilityBlotting, WesternModels, BiologicalAntineoplastic Agents, PhytogenicMolecular Sequence DataCells, CulturedFungal ProteinsCell NucleusBRCA1 ProteinDNAMimosineAntineoplastic AgentsAllyl CompoundsInterphaseGenes, p53CDC2-CDC28 KinasesKinetochoresAphidicolinCyclin ADose-Response Relationship, RadiationIntracellular Signaling Peptides and ProteinsTranscription FactorsGene Expression Regulation, NeoplasticMethyl MethanesulfonateDNA Repair EnzymesProtein BindingAmino Acid SequenceTime FactorsCaffeineChromatinDose-Response Relationship, DrugNucleic Acid Synthesis InhibitorsBase SequenceCarrier Proteins