Cell CycleCell Cycle ProteinsCheckpoint Kinase 2Cell Cycle CheckpointsDNA DamageG2 PhaseGenes, cdcAtaxia Telangiectasia Mutated ProteinsHeterotrimeric GTP-Binding ProteinsProtein-Serine-Threonine KinasesMitosisS PhaseG2 Phase Cell Cycle CheckpointsG1 PhaseProtein KinasesDNA RepairTumor Suppressor Protein p53DNA-Binding ProteinsEukaryotic CellsTumor Suppressor ProteinsPhosphorylationNuclear ProteinsDNA ReplicationM Phase Cell Cycle CheckpointsAtaxia TelangiectasiaGamma Rayscdc25 PhosphatasesRadiation, IonizingMolecular Sequence DataSignal TransductionHydroxyureaSpindle ApparatusCyclinsMutationCyclin-Dependent Kinase Inhibitor p21CDC2 Protein KinaseCyclin BSaccharomyces cerevisiae ProteinsCell DivisionSaccharomyces cerevisiaeAmino Acid SequenceCell LineGTP-Binding Protein alpha SubunitsRadiation ToleranceApoptosisGenomic InstabilitySchizosaccharomycesG1 Phase Cell Cycle CheckpointsHeLa CellsModels, BiologicalProtein BindingSchizosaccharomyces pombe ProteinsCyclin B1Fungal ProteinsCell Line, TumorUltraviolet RaysS Phase Cell Cycle CheckpointsNocodazoleFibroblastsDNA Breaks, Double-StrandedRetinoblastoma ProteinChromosomal InstabilityBase SequenceDNAGTP-Binding Protein beta SubunitsCell NucleusHistonesGTP-Binding ProteinsFlow CytometryBRCA1 ProteinCyclin-Dependent Kinase 2Tumor Cells, CulturedCells, CulturedSequence Homology, Amino AcidGenes, p53Intracellular Signaling Peptides and ProteinsCell ProliferationKinetochoresProtein Structure, TertiaryRNA, Small InterferingCell SurvivalGTP-Binding Protein alpha Subunits, Gi-GoCyclin EGTP-Binding Protein gamma SubunitsCarrier ProteinsEnzyme ActivationTransfectionMethyl MethanesulfonateDNA Repair EnzymesMimosineCyclin-Dependent KinasesCDC2-CDC28 KinasesRecombinant Fusion ProteinsBlotting, WesternCaffeineTime FactorsAphidicolinCyclin ATranscription, GeneticRNA, Messenger