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nucleated erythrocyteA red cell with a nucleus, which is usually lysed before the reticulocyte stage of RBC maturation. Scattered nucleated erythrocytes are a normal finding in the peripheral blood of newborns, but distinctly abnormal in adults and seen in thalassemia major or leukoerythroblastic reactions; in the foetus, > 5/100 NRBCs in the circulation is typically seen with hypoxia.
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