Cell CycleCell Cycle ProteinsCell Cycle CheckpointsG2 PhaseDNA DamageS PhaseCheckpoint Kinase 2G1 PhaseMitosisGenes, cdcProtein-Serine-Threonine KinasesAtaxia Telangiectasia Mutated ProteinsG2 Phase Cell Cycle CheckpointsCyclinsTumor Suppressor Protein p53Cell DivisionCyclin-Dependent Kinase Inhibitor p21DNA-Binding ProteinsTumor Suppressor ProteinsProtein KinasesDisease ProgressionPhosphorylationApoptosisCDC2 Protein KinaseNuclear ProteinsDNA Repaircdc25 PhosphatasesRetinoblastoma ProteinDNA ReplicationCyclin BCell ProliferationCell Line, TumorCyclin-Dependent Kinase 2Signal TransductionM Phase Cell Cycle CheckpointsCyclin-Dependent Kinase Inhibitor p27MutationCyclin-Dependent KinasesCell LineCyclin ESpindle ApparatusHydroxyureaCyclin D1G1 Phase Cell Cycle CheckpointsCyclin B1Gamma RaysCyclin ARadiation, IonizingFlow CytometryMolecular Sequence DataHeLa CellsCDC2-CDC28 KinasesSaccharomyces cerevisiae ProteinsAtaxia TelangiectasiaSaccharomyces cerevisiaeModels, BiologicalCyclin-Dependent Kinase 4SchizosaccharomycesFibroblastsTumor Cells, CulturedCells, CulturedGenomic InstabilityS Phase Cell Cycle CheckpointsCell NucleusRadiation ToleranceNocodazoleCell SurvivalSchizosaccharomyces pombe ProteinsDNATranscription FactorsAmino Acid SequenceTime FactorsRNA, Small InterferingHistonesG0 PhaseUltraviolet RaysMimosineE2F Transcription FactorsFungal ProteinsProtein BindingBlotting, WesternGene Expression RegulationBase SequenceE2F1 Transcription FactorInterphaseRNA, MessengerTransfectionTranscription, GeneticDNA Breaks, Double-StrandedAntineoplastic AgentsGene Expression Regulation, NeoplasticDown-RegulationCarrier ProteinsChromosomal InstabilityProto-Oncogene ProteinsRNA InterferenceEnzyme InhibitorsBromodeoxyuridineIntracellular Signaling Peptides and ProteinsCentrosome