Polycythemia VeraPolycythemiaHydroxyureaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersPipobromanThrombocytosisErythroid Precursor CellsAloeErythropoietinPhlebotomyAntisickling AgentsReceptors, ThrombopoietinErythropoiesisGranulocytesHematocritReceptors, ErythropoietinThrombosisBloodlettingErythrocytesBlood CellsMutationErythroid CellsPlatelet CountHematopoiesis, ExtramedullaryMutation, MissenseAnemia, Sickle CellAmino Acid SubstitutionColony-Forming Units AssayGPI-Linked ProteinsMegakaryocytesBone MarrowLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeHematopoietic Stem CellsBudd-Chiari SyndromeFetal HemoglobinIsoantigensHemoglobinsSplenomegalyHomozygoteThrombopoietinChromosomes, Human, 19-20Leukocytosis