Purity ~98% (SDS-PAGE gel, HPLC). 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 and has been shown to act synergistically with colony stimulating factors. Human SCF is an 18.4kDa protein containing 164 amino acid residues. Source: Recombinant protein corresponding to human SCF, expressed in E. coli. Biological Activity: Determined by its ability to stimulate the proliferation of human TF-1 cells. The expected ED50 is 5x10e5units/mg. Endotoxin: <0.1ng/ug of protein AA Sequence: MEGICRNRVT NNVKDVTKLV ANLPKDYMIT LKYVPGMDVL PSHCWISEMV VQLSDSLTDL LDKFSNISEG LSNYSIIDKL VNIVDDLVEC VKENSSKDLK KSFKSPEPRL FTPEEFFRIF NRSIDAFKDF VVASETSDCV VSSTLSPEKD SRVSVTKPFM LPPVA Protein Content: Verified by UV Spectroscopy and/or SDS-PAGE gel.