IL-15R alpha is a high affinity receptor for IL-15 (Kd: 100 pM). IL-15 is essential for the development and function natural killer (NK) cell, NKT cell and memory (m) CD8+ T cell. IL-15R alpha maintains memory CD8+ T cell homeostasis and lymphocyte development. IL-15R alpha/IL-15 complex can activate the antitumor functions of NK cells and CD8+ T cells. IL-15R alpha & IL-15 Fusion Protein, Human (HEK293, Fc) is a recombinant human IL-15R alpha (I31-D96) & IL-15 (N49-S162) fusion protein with a C-Terminal hFc tag, which is produced in HEK293 cells.