NCIt definition : Macrophage colony-stimulating factor 1 (554 aa, 60 kDa) is encoded by the human CSF1
gene. This protein is involved in in the regulation of survival, proliferation and
differentiation of mononuclear phagocytes.;
NCIt note : The active forms of macrophage colony-stimulating factor 1 may be produced by proteolytic
cleavage; precursors may exist as integral membrane proteins. Isoform 1 may undergo
rapid proteolytic cleavage to yield an extracellular growth factor. Isoform 3 may
exist as an integral membrane protein that undergoes slow proteolysis at the cell
surface to yield a soluble growth factor.;