Cell CycleCell Cycle ProteinsGenes, cdcCheckpoint Kinase 2DNA DamageG2 PhaseCell Cycle CheckpointsMitosisProtein-Serine-Threonine KinasesAtaxia Telangiectasia Mutated ProteinsS PhaseProtein KinasesDNA RepairHydroxyureaSpindle ApparatusG2 Phase Cell Cycle CheckpointsTumor Suppressor Protein p53M Phase Cell Cycle CheckpointsDNA-Binding ProteinsG1 PhaseTumor Suppressor ProteinsNuclear ProteinsDNA ReplicationGamma RaysMutationMad2 ProteinsSaccharomyces cerevisiae ProteinsSchizosaccharomycesFungal ProteinsSchizosaccharomyces pombe ProteinsSaccharomyces cerevisiaeCell Line, TumorChromosomal InstabilityAtaxia TelangiectasiaPhosphorylationRadiation, Ionizingcdc25 PhosphatasesCyclin-Dependent Kinase Inhibitor p21Ultraviolet RaysCyclinsCell DivisionCDC2 Protein KinaseMolecular Sequence DataGenes, FungalCyclin BGenomic InstabilityRadiation ToleranceApoptosisIntracellular Signaling Peptides and ProteinsCell LineSignal TransductionG1 Phase Cell Cycle CheckpointsBase SequenceHeLa CellsCyclin B1DNA, FungalFibroblastsS Phase Cell Cycle CheckpointsGene DeletionCell ProliferationModels, BiologicalRetinoblastoma ProteinNocodazoleFlow CytometryDNA Breaks, Double-StrandedNeoplasm ProteinsGenes, p53Repressor ProteinsDrug StabilityBRCA1 ProteinPhenotypeAneuploidyCell SurvivalDNAHistonesCyclin-Dependent Kinase 2Amino Acid SequenceCell NucleusCells, CulturedCDC28 Protein Kinase, S cerevisiaeGene Expression Regulation, NeoplasticTime FactorsChromosomes, FungalProtein BindingProtein StabilityRNA, Small InterferingKinetochoresNeoplasmsGenes, Tumor SuppressorTumor Cells, CulturedCyclin ERNA, MessengerDNA Repair EnzymesTumor Markers, BiologicalTransfectionMethyl MethanesulfonateMimosineAllelesBlotting, WesternDNA Primers