Cell CycleCell Cycle ProteinsCheckpoint Kinase 2Cell Cycle CheckpointsMitosisApoptosisS PhaseG2 PhaseDNA DamageG1 PhaseGenes, cdcProtein-Serine-Threonine KinasesM Phase Cell Cycle CheckpointsG2 Phase Cell Cycle CheckpointsCell DivisionCell Line, TumorTumor Suppressor Protein p53CyclinsPhosphorylationCell ProliferationSignal TransductionDNA ReplicationProtein KinasesNuclear ProteinsCyclin-Dependent Kinase Inhibitor p21DNA-Binding ProteinsSpindle ApparatusCDC2 Protein KinaseCell LineS Phase Cell Cycle CheckpointsCaspasesAtaxia Telangiectasia Mutated ProteinsCell SurvivalFlow CytometryMutationTumor Suppressor ProteinsApoptosis Regulatory ProteinsCaspase 3Cyclin BRetinoblastoma ProteinHeLa CellsMenstrual CycleCells, CulturedProto-Oncogene Proteins c-bcl-2Tumor Cells, CulturedSaccharomyces cerevisiae ProteinsHydroxyureaCyclin-Dependent Kinase Inhibitor p27G1 Phase Cell Cycle Checkpointscdc25 PhosphatasesSaccharomyces cerevisiaeMolecular Sequence DataSchizosaccharomycesInhibitor of Apoptosis ProteinsKinetochoresCyclin-Dependent Kinase 2Blotting, WesternModels, BiologicalCell NucleusNocodazoleG0 PhaseTime FactorsSchizosaccharomyces pombe ProteinsDNA RepairCyclin B1RNA, Small InterferingEnzyme ActivationCyclin D1Antineoplastic AgentsDNA FragmentationCyclin ACyclin ETranscription FactorsRNA, MessengerInterphaseProto-Oncogene ProteinsTransfectionGene Expression Regulationbcl-2-Associated X ProteinFungal ProteinsAmino Acid SequenceDNAProtein BindingIn Situ Nick-End LabelingDown-RegulationEnzyme InhibitorsFibroblastsCDC2-CDC28 KinasesGamma RaysCarrier ProteinsIntracellular Signaling Peptides and ProteinsCyclin-Dependent Kinase 4RNA InterferenceTranscription, GeneticBase SequenceUbiquitin-Protein Ligase ComplexesCell DifferentiationHistonesCdc20 ProteinsChromosome Segregation