Polycythemia VeraPolycythemiaHydroxyureaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersPipobromanThrombocytosisErythroid Precursor CellsAloeErythropoietinPhlebotomyAntisickling AgentsReceptors, ThrombopoietinErythropoiesisGranulocytesReceptors, ErythropoietinThrombosisMutationBloodlettingHematocritErythroid CellsMutation, MissensePlatelet CountHematopoiesis, ExtramedullaryAmino Acid SubstitutionGPI-Linked ProteinsColony-Forming Units AssayAnemia, Sickle CellMegakaryocytesLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeBone MarrowBudd-Chiari SyndromeIsoantigensHomozygoteSplenomegalyFetal HemoglobinChromosomes, Human, 19-20Hematopoietic Stem CellsThrombopoietin