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, Canine (HEK293, His) is a recombinant canine IL-2R betawith a C-Terminal His tag, which is produced in HEK293 cells.