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Erythropoiesis is the process of erythrocyte - red blood cell - production. All erythrocytes are derived from the division and differentiation of a common stem cell precursor.
The site of erythropoiesis varies with developmental stage:
If the adult is chronically stressed, the sites of erythropoiesis may re-extend to involve both liver and spleen.
There are a number of factors controlling erythropoiesis. Erythropoietin is the key hormone.