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Erythroid precursors in the bone marrow

Erythroid precursors in the bone marrow
Normal bone marrow shows an erythropoietic island with a large proerythroblast (blue arrow) surrounded by basophilic (yellow arrow), polychromatophilic (red arrow), and orthochromic (black arrow) normoblasts.
Courtesy of Stanley L Schrier, MD.
Graphic 68933 Version 2.0