Bone Marrow CellsBone MarrowBone Marrow TransplantationUmbilical VeinsUmbilical ArteriesHematopoietic Stem CellsColony-Forming Units AssayHematopoiesisHernia, UmbilicalCells, CulturedBone Marrow DiseasesFetal BloodBone Marrow ExaminationCell DifferentiationRadiation ChimeraMice, Inbred C57BLBone Marrow NeoplasmsGranulocytesHuman Umbilical Vein Endothelial CellsAntigens, CD34Transplantation, HomologousWhole-Body IrradiationBone Marrow PurgingUmbilicusFlow CytometrySpleenColony-Stimulating FactorsMegakaryocytesCell SeparationCell DivisionLeukemiaStromal CellsTransplantation, AutologousEndothelium, VascularHematopoietic Stem Cell TransplantationCord Blood Stem Cell TransplantationErythropoiesisTime FactorsTransplantation ChimeraAnemia, AplasticGraft vs Host DiseaseMice, Inbred BALB CEndothelial CellsPregnancyStem Cell FactorLeukemia, Myeloid, AcuteStem CellsAntigens, CDThymus GlandGranulocyte Colony-Stimulating FactorOsteoclastsCell LineageGraft SurvivalCell CountT-LymphocytesMice, Inbred StrainsRetroviridaeLeukemia, MyeloidGranulocyte-Macrophage Colony-Stimulating FactorMyelodysplastic SyndromesInterleukin-3Blood CellsUltrasonography, PrenatalFetusMice, KnockoutMacrophagesBlood Cell CountMice, TransgenicImmunophenotypingMice, Inbred C3HRNA, MessengerHematopoietic Cell Growth FactorsCell AdhesionClone CellsRecombinant ProteinsLeukocyte CountAntibodies, MonoclonalErythroid Precursor CellsChimeraCell ProliferationCell SurvivalCell MovementProto-Oncogene Proteins c-kitOsteogenesisAntigens, SurfaceHematopoietic SystemNeovascularization, PhysiologicCoculture TechniquesLeukocytesMultiple MyelomaLymphocytesCell LinePancytopeniaTransplantation, IsogeneicOsteoblastsLeukemia, Myelogenous, Chronic, BCR-ABL PositiveErythropoietinInfant, NewbornTransplantation ConditioningCell Culture Techniques