IL-2R beta (CD122), a type 1 cytokine receptor expressed on T lymphocytes, is a receptor for IL-2 (Kd: 1 nM approximately)[1]. IL-2R beta mediates T cell immune responses, such as stimulating T cell proliferation and activating lymphokine-activated killer cells[2]. IL-2R beta/CD122 Protein, Rhesus Macaque (HEK293, Fc) is a recombinant Rhesus Macaque IL-2R beta with a C-Terminal hFc tag, which is produced in HEK293 cells.