Stem Cell Factor (SCF) is a hematopoietic growth factor that exerts its activity at the early stages of hematopoiesis. SCF stimulates the proliferation of myeloid, erythroid, and lymphoid progenitors in bone marrow cultures. Recombinant rat SCF contains 165aa residues, which corresponds to the sequence of the secreted soluble form of SCF.Source:Recombinant protein corresponding to rat SCF, expressed in E. coli. Molecular Weight: ~18.4kDBiological Activity:The ED50, as determined by the dose-dependent stimulation of the proliferation of human MO7e cells, is <10ng/ml, corresponding to a specific activity of >1x10e5units/mg.Endotoxin:<0.1ng/ugStorage and Stability:Lyophilized powder may be stored at -20°C. Reconstitute with sterile dH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Reconstituted product is stable for 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.