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Bone Marrow: Multilobulated Normoblast. Image courtesy of Professor Peter Anderson DVM PhD and published with permission © PEIR, University of Alabama at Birmingham, Department of Pathology

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


An erythroblast is a type of red blood cell which still retains a cell nucleus. It is the immediate precursor of a normal erythrocyte.


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.

Image Description
Proerythroblast.png Pronormoblast
Basophilic erythroblast.png Basophilic normoblast
Polychromatic erythroblast.png Polychromatic normoblast (also polychromatophilic)
Orthochromatic erythroblast.png Orthochromatic normoblast (also orthochromatophilic)

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