GCSF is a cytokine that controls the production，differentiation，and function of granulocytes. The active protein is found extracellularly. Three transcript variants encoding three different isoforms have been found for this gene. Granulocyte/macrophage colony-stimulating factors are cytokines that act in hematopoiesis by controlling the production，differentiation，and function of 2 related white cell populations of the blood，the granulocytes and the monocytes-macrophages. This csf induces granulocytes.
