Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Myeloproliferative DisordersPrimary MyelofibrosisErythropoietinPipobromanErythroid Precursor CellsThrombocytosisPhlebotomyBloodlettingErythropoiesisAloeReceptors, ThrombopoietinHematocritReceptors, ErythropoietinHemoglobins, AbnormalGranulocytesThrombosisHydroxyureaColony-Forming Units AssayMutationMutation, MissenseHypoxia-Inducible Factor-Proline DioxygenasesHematopoiesis, ExtramedullaryBone MarrowDiphosphoglyceric AcidsErythroid CellsAmino Acid SubstitutionErythrocyte VolumeGPI-Linked ProteinsPlatelet CountHemoglobinsMegakaryocytesBudd-Chiari SyndromeIsoantigensLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20Erythrocyte CountThrombopoietinHomozygoteChromium Isotopes