Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersPipobromanThrombocytosisErythroid Precursor CellsAloeLungErythropoietinPhlebotomyReceptors, ThrombopoietinErythropoiesisGranulocytesReceptors, ErythropoietinThrombosisHydroxyureaBloodlettingHematocritMutationMutation, MissenseLung DiseasesHematopoiesis, ExtramedullaryErythroid CellsAmino Acid SubstitutionGPI-Linked ProteinsPlatelet CountLung NeoplasmsMegakaryocytesColony-Forming Units AssayBudd-Chiari SyndromeIsoantigensLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20Bone MarrowThrombopoietinHomozygoteSplenomegalyHematopoietic Stem Cells