Neuroectodermal Tumors, PrimitiveNeuroendocrine TumorsNeuroectodermal Tumors, Primitive, PeripheralMedulloblastomaNeuroectodermal TumorsCerebellar NeoplasmsVipomaPinealomaPrimitive StreakPancreatic NeoplasmsBrain NeoplasmsSarcoma, EwingCentral Nervous System NeoplasmsHematopoietic Stem CellsGastrulaEndodermHematopoiesisImmunohistochemistryAntigens, CD34PrognosisYolk SacCell DifferentiationCell LineageColony-Forming Units AssayErythropoiesisMesodermGene Expression Regulation, DevelopmentalBone Marrow CellsADP-ribosyl CyclaseGerm LayersStem Cell FactorChick EmbryoAntigens, CD38Erythroid Precursor CellsEmbryo, MammalianEctodermFossilsBlastodermBiological EvolutionBody PatterningCells, CulturedIn Situ HybridizationHagfishesHematopoietic Cell Growth FactorsBone MarrowInterleukin-3Stem CellsErythroblastsCell DivisionNAD+ NucleosidaseEmbryonic and Fetal DevelopmentMolecular Sequence DataChimeraHematopoietic SystemGATA6 Transcription FactorFetal ProteinsAntigens, CDEvolution, ChemicalMorphogenesisFetal BloodDentitionEmbryonic Stem CellsBiogenesisHomeodomain ProteinsHemangioblastsCell SeparationPhylogenyErythroid CellsTranscription FactorsGastrulationAntigens, DifferentiationMeteoroidsEmbryo, NonmammalianBase SequenceMyelopoiesisZebrafish ProteinsSupratentorial NeoplasmsZebrafishEmbryonic InductionEmbryonic DevelopmentFlow CytometryMice, Inbred C57BLGATA1 Transcription FactorAmino Acid SequenceMice, SCIDNodal ProteinThrombopoietinMegakaryocytesSignal TransductionRNA-Binding Protein EWSCell Culture TechniquesSharksGiardia lambliaTime FactorsProto-Oncogene Proteins c-kitLeukemia, Myelogenous, Chronic, BCR-ABL PositiveProto-Oncogene Protein c-fli-1Skates (Fish)DinosaursFetus