Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersBone and BonesPipobromanThrombocytosisErythroid Precursor CellsAloeErythropoietinPhlebotomyReceptors, ThrombopoietinBone RemodelingErythropoiesisBone MarrowGranulocytesReceptors, ErythropoietinBone DensityThrombosisHydroxyureaBloodlettingHematocritBone Marrow CellsBone ResorptionMutation, MissenseMutationHematopoiesis, ExtramedullaryErythroid CellsAmino Acid SubstitutionGPI-Linked ProteinsPlatelet CountMegakaryocytesColony-Forming Units AssayHematopoietic Stem CellsBone NeoplasmsBudd-Chiari SyndromeBone DevelopmentIsoantigensLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeThrombopoietinChromosomes, Human, 19-20HomozygoteBone Marrow NeoplasmsBone DiseasesSplenomegaly