NCIt definition : An immature cell that represents the first stage in the granulocytic series of hematopoiesis.
It is found in bone marrow and differentiates into a promyelocyte. Its nucleus is
composed of very fine, evenly distributed chromatin with 2-5 nucleoli. The cytoplasm
is basophilic and non-granular.;
Alternative definition : NCI-GLOSS: Refers to myeloblasts (a type of immature cell that forms in the bone marrow).;