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A promegakaryocyte is a precursor cell for a megakaryocyte, arising from a megakaryoblast.
The developmental stages of the megakaryocyte are: CFU-Me (pluripotential hemopoietic stem cell or hemocytoblast) → megakaryoblast → promegakaryocyte → megakaryocyte.
References
Promegakaryocyte Wikipedia(Text) CC BY-SA