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An normoblast is a type of red blood cell which still retains a cell nucleus. It is the immediate precursor of a normal erythrocyte (by opposition to the megaloblasts being an abnormal precursor).


The term normoblast is sometimes used as a synonym for erythroblast, but at other times it is considered a subcategory. In the latter context, there are two types of erythroblasts:


There are four stages in the development of a normoblast.

A comprehensive diagram of human hematopoiesis
Illustration Description Image
Proerythroblast.png Pronormoblast
Basophilic erythroblast.png Basophilic normoblast Prorubricyte.jpg
Polychromatic erythroblast.png Polychromatic normoblast (also polychromatophilic) Rubricyte.jpg
Orthochromatic erythroblast.png Orthochromatic normoblast (also orthochromatophilic) Metarubricyte.jpg

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