granulocytopoietic cell myelocyte Jie Zheng A cell type that is the first of the maturation stages of the granulocytic leukocytes normally found in the bone marrow. Granules are seen in the cytoplasm. The nuclear material of the myelocyte is denser than that of the myeloblast but lacks a definable membrane. The cell is flat and contains increasing numbers of granules as maturation progresses. SNOMEDCT:127915008 A cell derived from a promyelocyte. It differentiates into a metamyelocyte. It has a diameter of 10-18 micrometer, and an oval or round nucleus with finely granulated chromatin. NCIt:C13115 Tomasz Adamusiak cell type