What is immediately apparent in the cell indicated by the arrow is the granules. Promyelocytes generally have prominent reddish azurophilic granules that may overlie the nucleus. (Azurophilic granules are so-called because they stain with blue aniline dyes.) The N:C ratio of promyelocytes varies from about 4:1-2:1. They may appear more basophilic than blasts because the blueness is seen throughout the cytoplasm. Compare the color of the promyelocyte to that of the other cells in the field. There are two myelocytes below the promyelocyte.
Course Section: 04. Immature Cells in the Granulocytic - Monocytic - and Lymphocytic Series
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