The cell indicated by the arrow is an eosinophilic myelocyte. The maturation of eosinophils and basophils is the same as that of neutrophils. Eosinophilic granules are all about the same size and larger than neutrophilic ones. As the cell progresses from a myelocyte to a mature eosinophil, the granules change color from purple to blue to various shades of orange. It was formerly believed that cells could contain both eosinophilic and basophilic granules but cytochemistry and electron microscopy have disproved this.
Course Section: 04. Immature Cells in the Granulocytic - Monocytic - and Lymphocytic Series
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