Myeloproliferative DisordersPrimary MyelofibrosisJanus Kinase 2Polycythemia VeraThrombocythemia, EssentialMyelodysplastic-Myeloproliferative DiseasesReceptors, ThrombopoietinBone Marrow NeoplasmsThrombocytosisSplenomegalyLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeLeukemia, Myelomonocytic, ChronicLeukemia, Myelomonocytic, JuvenileMutationHematopoiesis, ExtramedullaryMyelodysplastic SyndromesAnemia, RefractoryProto-Oncogene Proteins c-cblBone MarrowPhiladelphia ChromosomeMegakaryocytesJanus KinasesHematologic NeoplasmsHematologySTAT5 Transcription FactorLeukemia, Myelogenous, Chronic, BCR-ABL PositiveMegakaryocyte Progenitor CellsLeukemia, Myeloid, AcuteHematopoietic Stem CellsBlast CrisisProtein Kinase InhibitorsMutation, MissenseClonal EvolutionAmino Acid SubstitutionReticulinPyrazolesDNA Mutational AnalysisOsteosclerosisFusion Proteins, bcr-ablLeukemia, MyeloidGene Knock-In TechniquesMyeloid Progenitor CellsMegakaryocyte-Erythroid Progenitor CellsMyelopoiesisAnemia, SideroblasticBone Marrow DiseasesCell Transformation, NeoplasticThrombopoietinLeukemiaPoint MutationProto-Oncogene ProteinsDisease ProgressionCell ProliferationPrognosisNeoplasmsLeukemia, Megakaryoblastic, AcuteSignal TransductionHypereosinophilic SyndromeOsteoarthropathy, Primary HypertrophicPolycythemiaExonsHepatomegalyThrombosisLeukocytosisAllelesLeukemia, Neutrophilic, ChronicSplenectomyTreatment OutcomePhenotypePlatelet CountPancreatic NeoplasmsHematopoiesisCohort StudiesDisease Models, AnimalPancytopeniaBone Marrow ExaminationPolymerase Chain ReactionMice, Inbred C57BLSpleenDNA-Binding ProteinsGranulocytesAntineoplastic AgentsItalyRepressor ProteinsOncogene Proteins, FusionBone Marrow CellsKaryotypingHydroxyureaCase-Control StudiesJanus Kinase 1Sarcoma Viruses, MurineAntigens, CD34Germ-Line MutationThrombocytopeniaFatal OutcomePipobromanBlood Cell CountGATA1 Transcription FactorNeoplasms, Cystic, Mucinous, and SerousReceptor, Fibroblast Growth Factor, Type 1