Proliferating Cell Nuclear AntigenCell CycleCell ProliferationCell Cycle ProteinsCell Cycle CheckpointsCheckpoint Kinase 2DNA DamageG2 PhaseGenes, cdcAtaxia Telangiectasia Mutated ProteinsProtein-Serine-Threonine KinasesS PhaseMitosisCell DivisionG2 Phase Cell Cycle CheckpointsG1 PhaseTumor Suppressor Protein p53Protein KinasesDNA RepairTumor Suppressor ProteinsDNA-Binding ProteinsApoptosisPhosphorylationCell Line, TumorSignal TransductionNuclear ProteinsCyclin-Dependent Kinase Inhibitor p21DNA ReplicationCyclinsM Phase Cell Cycle CheckpointsGamma Rayscdc25 PhosphatasesAtaxia TelangiectasiaRadiation, IonizingCells, CulturedHydroxyureaCDC2 Protein KinaseSpindle ApparatusCell LineCyclin BMutationG1 Phase Cell Cycle CheckpointsRadiation ToleranceFibroblastsGenomic InstabilityFlow CytometryCell SurvivalRetinoblastoma ProteinTumor Cells, CulturedCyclin B1HeLa CellsMolecular Sequence DataModels, BiologicalSaccharomyces cerevisiae ProteinsS Phase Cell Cycle CheckpointsRNA, Small InterferingSchizosaccharomycesUltraviolet RaysBromodeoxyuridineDNANocodazoleSaccharomyces cerevisiaeBlotting, WesternCyclin-Dependent Kinase 2Schizosaccharomyces pombe ProteinsDNA Breaks, Double-StrandedChromosomal InstabilityRNA, MessengerCyclin D1Cell NucleusCyclin-Dependent Kinase Inhibitor p27Cyclin ECell DifferentiationHistonesTime FactorsIntracellular Signaling Peptides and ProteinsBRCA1 ProteinTransfectionGene Expression RegulationGene Expression Regulation, NeoplasticGenes, p53RNA InterferenceProtein BindingAmino Acid SequenceCyclin-Dependent KinasesFungal ProteinsAntineoplastic AgentsTranscription FactorsBase SequenceCyclin ADown-RegulationCDC2-CDC28 KinasesEnzyme InhibitorsEnzyme ActivationKinetochoresPhenotypeMice, KnockoutImmunohistochemistryMimosineProto-Oncogene Proteins