Purity ≥95% (SDS-PAGE). Recombinant GM-CSF comprises a 127 amino acid fragment (18-144) corresponding to the mature GM-CSF protein and is expressed in E. coli with an amino-terminal hexahistidine tag. GM-CSF is a potent species-specific growth factor produced by a variety of cell types including T cells, B cells, macrophages, mast cells and endothelial cells. GM-CSF is produced in response to cytokine or immune stimulation and has been shown to stimulate the proliferation, maturation and function of hematopoietic cells. Applications: Suitable for use in ELISA.