SCF protein.Stem Cell Factor (SCF) plays an important role inhematopoiesis and survival, proliferation, and differentiation of mast cells, melanocytes, and germ cells.SCF mediates its biological effects by binding to andactivating a receptor tyrosine kinase designated c-kit orSCF receptor (SCFR).SCF is also known as mast cell growth factor (MCGF),steel (Sl) factor (SLF), or kit ligand (KL).Recombinant human SCF produced in E. coli is a single,non-glycosylated polypeptide chain containing165 amino acids and having a molecular mass of18.409 kDa.The SCF is purified by proprietary chromatographic techniques. Purity > 95% pure by SDS-PAGE and RP-HPLC