Cell CycleCell Cycle ProteinsCheckpoint Kinase 2S PhaseS Phase Cell Cycle CheckpointsGenes, cdcProtein-Serine-Threonine KinasesDNA DamageG2 PhaseMitosisAtaxia Telangiectasia Mutated ProteinsG1 PhaseCell Cycle CheckpointsDNA ReplicationM Phase Cell Cycle CheckpointsProtein KinasesHydroxyureaNuclear ProteinsDNA-Binding ProteinsDisease Progressioncdc25 PhosphatasesPhosphorylationTumor Suppressor ProteinsSaccharomyces cerevisiae ProteinsG2 Phase Cell Cycle CheckpointsSpindle ApparatusCyclinsSaccharomyces cerevisiaeCell DivisionMutationCell Line, TumorRadiation, IonizingDNA RepairCDC2 Protein KinaseHeLa CellsKinetochoresCyclin BRetinoblastoma ProteinCyclin-Dependent KinasesCell ProliferationCell LineCyclin-Dependent Kinase Inhibitor p21ApoptosisCyclin-Dependent Kinase 2Signal TransductionAphidicolinChromosomal Proteins, Non-HistoneNaphthalimidesCyclin-Dependent Kinase Inhibitor p27Tumor Suppressor Protein p53SchizosaccharomycesSchizosaccharomyces pombe ProteinsNocodazoleCyclin D1Models, BiologicalCyclin ECyclin B1Cyclin ADNA, FungalMolecular Sequence DataAtaxia TelangiectasiaCDC2-CDC28 KinasesCdc20 ProteinsChromosome SegregationFlow CytometryFungal ProteinsE2F Transcription FactorsCyclin-Dependent Kinase 4Ubiquitin-Protein Ligase ComplexesG1 Phase Cell Cycle CheckpointsReplication OriginE2F1 Transcription FactorAnaphase-Promoting Complex-CyclosomeAnaphaseTranscription FactorsRNA, Small InterferingCell NucleusG0 PhaseProtein BindingCells, CulturedAmino Acid SequenceTumor Cells, CulturedMetaphaseCell SurvivalBlotting, WesternTime FactorsIntracellular Signaling Peptides and ProteinsAurora KinasesHistonesGenomic InstabilityDNARNA InterferenceFibroblastsCarrier ProteinsGene Expression RegulationCyclin DInterphaseGamma RaysRepressor ProteinsDown-Regulation