Hematopoietic Stem Cell TransplantationStem CellsStem Cell TransplantationTransplantation, HomologousImmune SystemTransplantation, AutologousHematopoietic Stem CellsTransplantationHematologic NeoplasmsGraft vs Host DiseaseEmbryonic Stem CellsAdult Stem CellsTransplantation ConditioningImmunocompromised HostCytomegalovirus InfectionsPeripheral Blood Stem Cell TransplantationTissue DonorsPluripotent Stem CellsTreatment OutcomeGraft SurvivalBone Marrow TransplantationOpportunistic InfectionsStem Cell NicheImmunosuppressive AgentsKidney TransplantationCell DifferentiationMycosesHistocompatibility TestingNeural Stem CellsAspergillosisMesenchymal Stem Cell TransplantationInduced Pluripotent Stem CellsRoseolovirus InfectionsRetrospective StudiesTime FactorsHematopoietic Stem Cell MobilizationHistocompatibilityTransplantsCytomegalovirusMultipotent Stem CellsMesenchymal Stromal CellsCells, CulturedStem Cell FactorRecurrenceGraft RejectionMice, Inbred C57BLT-LymphocytesFlow CytometryAntiviral AgentsWhole-Body IrradiationMultiple MyelomaAntifungal AgentsHematologic DiseasesTransplantation ChimeraLeukemiaCell LineageBusulfanAntigens, CD34ImmunosuppressionCord Blood Stem Cell TransplantationHerpesvirus 6, HumanFatal OutcomeHepatic Veno-Occlusive DiseaseImmunity, InnateCombined Modality TherapyGanciclovirBK VirusCell ProliferationSurvival RateNeoplasmsSurvival AnalysisBone Marrow CellsZygomycosisStem Cell ResearchSalvage TherapyImmune TolerancePolyomavirus InfectionsCyclosporineAcute DiseaseAnemia, AplasticRisk FactorsPlant StemsImmunologic FactorsFetal Stem CellsVirus DiseasesLymphoproliferative DisordersHeart TransplantationViral LoadFollow-Up StudiesInfectionLeukemia, Myelogenous, Chronic, BCR-ABL PositiveCell SeparationChimerismVirus ActivationHLA AntigensSignal TransductionProspective StudiesTriazolesPolymerase Chain ReactionPrecursor Cell Lymphoblastic Leukemia-Lymphoma