Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Primary MyelofibrosisMyeloproliferative DisordersBlood PlateletsThrombocytosisPlatelet AggregationPipobromanPlatelet CountErythroid Precursor CellsAloeErythropoietinPhlebotomyReceptors, ThrombopoietinPlatelet AdhesivenessErythropoiesisThrombosisGranulocytesPlatelet Membrane GlycoproteinsReceptors, ErythropoietinMegakaryocytesHematocritHydroxyureaBloodlettingPlatelet Factor 4Platelet TransfusionMutation, MissenseHematopoiesis, ExtramedullaryMutationErythroid CellsAmino Acid SubstitutionThrombopoietinGPI-Linked ProteinsThrombocytopeniaColony-Forming Units AssayPlatelet Activating FactorIsoantigensPlatelet Function TestsPlatelet Glycoprotein GPIIb-IIIa ComplexBudd-Chiari SyndromeBone MarrowLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeChromosomes, Human, 19-20Hematopoietic Stem CellsPlatelet Glycoprotein GPIb-IX ComplexHomozygoteSplenomegaly