MegakaryocytesThrombopoiesisThrombopoietinBlood PlateletsPloidiesMegakaryocyte Progenitor CellsThrombocytopeniaReceptors, ThrombopoietinThrombocytosisPlatelet Factor 4Platelet CountBone Marrow CellsHematopoiesisNF-E2 Transcription Factor, p45 SubunitPlatelet Membrane Glycoprotein IIbNF-E2 Transcription FactorBone Marrow