Cell CycleCell Cycle ProteinsGenes, cdcDNA DamageCheckpoint Kinase 2G2 PhaseCell Line, TumorCell Cycle CheckpointsMitosisProtein-Serine-Threonine KinasesDisease ProgressionS PhaseAtaxia Telangiectasia Mutated ProteinsTumor Suppressor Protein p53Protein KinasesDNA RepairTumor Suppressor ProteinsDNA-Binding ProteinsSpindle ApparatusG2 Phase Cell Cycle CheckpointsHydroxyureaG1 PhaseMutationM Phase Cell Cycle CheckpointsTumor Cells, CulturedNuclear ProteinsCell DivisionDNA ReplicationGamma RaysApoptosisTumor Markers, BiologicalSignal TransductionPhosphorylationCell ProliferationMad2 ProteinsSaccharomyces cerevisiae ProteinsSchizosaccharomycesNeoplasmsGene Expression Regulation, NeoplasticFungal ProteinsSchizosaccharomyces pombe ProteinsChromosomal InstabilityCyclin-Dependent Kinase Inhibitor p21Cell LineCyclinsNeoplasm ProteinsMolecular Sequence DataRadiation, IonizingTumor BurdenSaccharomyces cerevisiaecdc25 PhosphatasesAtaxia TelangiectasiaUltraviolet RaysRadiation ToleranceCDC2 Protein KinaseFlow CytometryIntracellular Signaling Peptides and ProteinsTumor Necrosis Factor-alphaCyclin BBase SequenceGenes, Tumor SuppressorNeoplasms, ExperimentalCell SurvivalNeoplasm MetastasisGenes, FungalGenomic InstabilityCell Transformation, NeoplasticFibroblastsModels, BiologicalRNA, MessengerAntineoplastic AgentsTime FactorsGenes, p53HeLa CellsRNA, Small InterferingBreast NeoplasmsRetinoblastoma ProteinPhenotypeGene DeletionG1 Phase Cell Cycle CheckpointsBlotting, WesternTransfectionImmunohistochemistryCells, CulturedMammary Neoplasms, ExperimentalNeovascularization, PathologicMice, NudeBrain NeoplasmsColonic NeoplasmsCyclin B1Reverse Transcriptase Polymerase Chain ReactionTumor MicroenvironmentAdenocarcinomaRepressor ProteinsS Phase Cell Cycle CheckpointsDNA, FungalCell NucleusNocodazoleDNA, NeoplasmMice, Inbred C57BL