Description: Cytokine that stimulates the proliferation of T-lymphocytes. Stimulation by IL-15 requires interaction of IL-15 with components of IL-2R, including IL-2R beta and probably IL-2R gamma but not IL-2R alpha. (www.uniprot.org) Produced in E.coli as a single, non-glycosylated, polypeptide chain containing 114 amino acids (fragment 49-162) with an amino-terminal hexahistidine tag.