This cell is a promyelocyte observed in a preparation of normal bone marrow. The promyelocytes are the stage following the blast. Azurophilic granules distinguish the promyelocyte from the blast. Another difference is the slight clumping of the nuclear chromatin. The N:C ratio is usually smaller in the promyelocyte than in the blast.
Course Section: 04. Immature Cells in the Granulocytic - Monocytic - and Lymphocytic Series
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