Granulocyte [SEP] location of formation
have lower numbers. Granulocytes are produced via granulopoiesis in the bone marrow.
Types.
There are four types of granulocytes:
- Basophils
- Eosinophils
- Neutrophils
- Mast cells
Except for the mast cells, their names are derived from their staining characteristics; for example, the most abundant granulocyte is the neutrophil granulocyte, which has neutrally staining cytoplasmic granules.
Types Neutrophils.
Neutrophils are normally found in the bloodstream and are the most abundant type of phagocyte, constituting 60% to 65% of
which regulate the proliferation and maturation, such as interleukins IL-2, IL-3, IL-6, IL-7. Other factors, termed colony-stimulating factors (CSFs), specifically stimulate the production of committed cells. Three CSFs are granulocyte-macrophage CSF (GM-CSF), granulocyte CSF (G-CSF) and macrophage CSF (M-CSF). 
These stimulate granulocyte formation and are active on either progenitor cells or end product cells.
Erythropoietin is required for a myeloid progenitor cell to become an erythrocyte. On the