Stem CellsOrganizers, EmbryonicNucleolus Organizer RegionGoosecoid ProteinHematopoietic Stem CellsBody PatterningEmbryonic InductionCell DifferentiationGastrulaGene Expression Regulation, DevelopmentalXenopus ProteinsCell LineageHomeodomain ProteinsSilver StainingMyeloid Progenitor CellsEmbryo, NonmammalianZebrafish ProteinsEmbryologyMesodermOtx Transcription FactorsAntigens, CD34Bone Marrow CellsColony-Forming Units AssayCells, CulturedXenopusSignal TransductionZebrafishLymphoid Progenitor CellsIn Situ HybridizationFibroblast Growth Factor 8Wnt ProteinsTranscription FactorsNeural Stem CellsRhombencephalonHematopoiesisLIM-Homeodomain ProteinsIntercellular Signaling Peptides and ProteinsBone Morphogenetic ProteinsMesencephalonNodal ProteinCell ProliferationNotochordErythroid Precursor CellsMorphogenesisMice, Inbred C57BLHydraEctodermHeadNervous SystemXenopus laevisNodal Signaling LigandsMultipotent Stem CellsAxisTissue TransplantationNerve Tissue ProteinsMice, TransgenicMolecular Sequence DataNeurogenesisFlow CytometryCell DivisionBone MarrowBasic Helix-Loop-Helix Transcription FactorsEndodermNeuronsRegenerationWnt1 ProteinStem Cell TransplantationCell MovementCell SeparationGlycoproteinsChick EmbryoSilverCell CountMice, KnockoutGenes, HomeoboxCell NucleolusEndothelial CellsT-Box Domain ProteinsPhenotypeFetal BloodTime FactorsActivinsHedgehog ProteinsEmbryo, MammalianRNA, MessengerBase SequenceStem Cell FactorRepressor ProteinsImmunohistochemistryBone Morphogenetic Protein 4beta CateninReceptors, NotchOligodendrogliaFibroblast Growth FactorsNestinAdult Stem CellsModels, BiologicalDNA-Binding ProteinsGranulocyte-Macrophage Progenitor CellsFetal Proteins