Cell CycleS Phase Cell Cycle CheckpointsG2 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsG1 Phase Cell Cycle CheckpointsCell Cycle ProteinsInterphaseCheckpoint Kinase 2G2 PhaseCell Cycle CheckpointsDNA DamageS PhaseMitosisGenes, cdcG1 PhaseProtein-Serine-Threonine KinasesAtaxia Telangiectasia Mutated ProteinsProtein KinasesTumor Suppressor Protein p53cdc25 PhosphatasesSpindle ApparatusDNA RepairCDC2 Protein KinasePhosphorylationDNA-Binding ProteinsDNA ReplicationCyclin-Dependent Kinase Inhibitor p21Nuclear ProteinsTumor Suppressor ProteinsCell DivisionHydroxyureaCyclinsCyclin B1ApoptosisCell Line, TumorCyclin BGamma RaysHeLa CellsRadiation, IonizingAtaxia TelangiectasiaNocodazoleSchizosaccharomycesMutationSaccharomyces cerevisiae ProteinsKinetochoresCell ProliferationSchizosaccharomyces pombe ProteinsCell LineSignal TransductionRadiation ToleranceGenomic InstabilitySaccharomyces cerevisiaeFlow CytometryRetinoblastoma ProteinCyclin-Dependent Kinase 2Ultraviolet RaysCell NucleusCyclin-Dependent KinasesMetaphaseG0 PhaseDNA Breaks, Double-StrandedHistonesChromosomal InstabilityCell SurvivalCyclin EFungal ProteinsFibroblastsCyclin D1Cyclin-Dependent Kinase Inhibitor p27Molecular Sequence DataModels, BiologicalRNA, Small InterferingTumor Cells, CulturedChromosomesMicrotubulesDNACentrosomeChromatinBlotting, WesternCells, CulturedChromosome SegregationCdc20 ProteinsIntracellular Signaling Peptides and ProteinsBRCA1 ProteinAphidicolinMethyl MethanesulfonateAnaphaseProtein BindingCyclin-Dependent Kinase 4Antineoplastic Agents, PhytogenicAmino Acid SequenceAntineoplastic AgentsChromosomal Proteins, Non-HistoneMimosineCyclin ACDC2-CDC28 KinasesGenes, p53Dose-Response Relationship, RadiationDNA Repair EnzymesTranscription Factors