Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersPipobromanThrombocytosisErythroid Precursor CellsAloeErythropoietinPhlebotomyReceptors, ThrombopoietinErythropoiesisGranulocytesReceptors, ErythropoietinThrombosisHydroxyureaBloodlettingHematocritMutationMutation, MissenseHematopoiesis, ExtramedullaryErythroid CellsAmino Acid SubstitutionGPI-Linked ProteinsPlatelet CountMegakaryocytesColony-Forming Units AssayBudd-Chiari SyndromeLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeIsoantigensBone MarrowChromosomes, Human, 19-20ThrombopoietinHomozygoteSplenomegalyBone Marrow NeoplasmsHematopoietic Stem Cells