Cell CycleCell Cycle ProteinsCheckpoint Kinase 2Cell Line, TumorCell Cycle CheckpointsMitosisGenes, cdcTumor Cells, CulturedDNA DamageM Phase Cell Cycle CheckpointsG2 PhaseProtein-Serine-Threonine KinasesS PhaseCell DivisionTumor Suppressor Protein p53G1 PhaseG2 Phase Cell Cycle CheckpointsProtein KinasesTumor Suppressor ProteinsSpindle ApparatusCell ProliferationApoptosisDNA ReplicationPhosphorylationAtaxia Telangiectasia Mutated ProteinsSignal TransductionTumor Markers, BiologicalDNA-Binding ProteinsMutationCell LineS Phase Cell Cycle CheckpointsNuclear ProteinsNeoplasms, ExperimentalNeoplasmsKinetochoresCyclinsTumor BurdenHydroxyureaTumor Necrosis Factor-alphaCell SurvivalFlow CytometryCDC2 Protein KinaseMolecular Sequence DataSaccharomyces cerevisiae ProteinsCyclin-Dependent Kinase Inhibitor p21HeLa CellsAntineoplastic AgentsSchizosaccharomycesCyclin BDNA Repaircdc25 PhosphatasesNocodazoleRNA, MessengerSchizosaccharomyces pombe ProteinsTime FactorsSaccharomyces cerevisiaeNeoplasm ProteinsModels, BiologicalGenes, Tumor SuppressorGene Expression Regulation, NeoplasticRetinoblastoma ProteinBlotting, WesternRNA, Small InterferingTransfectionCells, CulturedMice, NudeNeoplasm MetastasisG1 Phase Cell Cycle CheckpointsBase SequenceMammary Neoplasms, ExperimentalCell NucleusNeoplasm TransplantationAmino Acid SequenceCell Transformation, NeoplasticBreast NeoplasmsCdc20 ProteinsXenograft Model Antitumor AssaysBrain NeoplasmsCarcinoma, Ehrlich TumorCyclin-Dependent Kinase Inhibitor p27Chromosome SegregationCyclin B1ImmunohistochemistryColonic NeoplasmsAdenocarcinomaProtein BindingTranscription FactorsReverse Transcriptase Polymerase Chain ReactionWilms TumorMice, Inbred BALB CFungal ProteinsFibroblastsAntigens, NeoplasmTransplantation, HeterologousCyclin-Dependent Kinase 2DNADown-RegulationGamma RaysMice, Inbred C57BLRNA Interference