GemininCell ProliferationCell Cycle ProteinsMinichromosome Maintenance Complex Component 2Cell CycleCells, CulturedCell DivisionCell DifferentiationXenopus ProteinsCell Line, TumorSignal TransductionApoptosisDNA ReplicationNuclear ProteinsKi-67 AntigenDNA-Binding ProteinsS PhaseCell LineImmunohistochemistryLymphocyte ActivationRNA, MessengerMice, Inbred C57BLBromodeoxyuridineCell MovementG1 PhaseCell SurvivalMitosisDown-RegulationCyclin ACyclin A2Reverse Transcriptase Polymerase Chain ReactionRNA, Small InterferingPhosphorylationGene Expression Regulation, DevelopmentalNissl BodiesGene Expression RegulationBlotting, WesternMice, KnockoutFlow CytometryTranscription FactorsRNA InterferenceTumor Cells, CulturedMolecular Sequence DataProliferating Cell Nuclear AntigenT-LymphocytesStem CellsGene Expression Regulation, NeoplasticBlastulaFibroblastsTime FactorsXenopus