Neoplastic Stem CellsMyeloproliferative DisordersStem CellsPolycythemia VeraJanus Kinase 2Hematopoietic Stem CellsPrimary MyelofibrosisThrombocythemia, EssentialStem Cell TransplantationEmbryonic Stem CellsAdult Stem CellsThrombocytosisPluripotent Stem CellsHematopoietic Stem Cell TransplantationStem Cell NicheReceptors, ThrombopoietinNeural Stem CellsCell DifferentiationInduced Pluripotent Stem CellsMyelodysplastic-Myeloproliferative DiseasesLeukemia, Myelomonocytic, ChronicMultipotent Stem CellsMesenchymal Stem Cell TransplantationStem Cell FactorMesenchymal Stromal CellsSplenomegalyLeukemia, Myelomonocytic, Juvenile