Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2HematocritPrimary MyelofibrosisMyeloproliferative DisordersHemoglobinsPipobromanThrombocytosisErythroid Precursor CellsErythropoietinAloePhlebotomyReceptors, ThrombopoietinErythropoiesisGranulocytesHemoglobin AHemoglobins, AbnormalBloodlettingReceptors, ErythropoietinHydroxyureaThrombosisMutation, MissenseHematopoiesis, ExtramedullaryErythroid CellsMutationPlatelet CountAmino Acid SubstitutionGPI-Linked ProteinsColony-Forming Units AssayMegakaryocytesBudd-Chiari SyndromeFetal HemoglobinBone MarrowIsoantigensHemoglobin, SickleLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20HomozygoteThrombopoietinErythrocyte VolumeHematopoietic Stem CellsSplenomegaly