Description: Supports IL-2 independent and IL-4 independent growth of helper T-cells. (www.uniprot.org) Produced in E.coli. Single, non-glycosylated single polypeptide chain containing 127amino acids. The ED50 as determined by the dose-dependant stimulation of human MO7e cells is < 0.5 ng/ml, corr. to a Specific Activity of 2 x 106 IU/mg.